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Ummm....Can you work out this puzzle?!

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  • #1

    Ummm....Can you work out this puzzle?!

    This has twisted my melon for a few days now....it's probably very simple, but...I cannae do it!

    It's a grade I received for an assignment.

    Part A was worth 75% and Part B worth 5%.

    The grades go from 8 to 19.

    The final grade would be worked out by dividing Part A's grade with Part B's to a ratio of 75%:25%.

    The final grade was 16.8.

    So, what was the grade for each part?

    (i.e. if part A was a grade 18 and Part B was 16 and they were worth 50% each I'd get 17)

    I haven't explained this well, have I?!?!?!

    Tags: None
  • #2
    Por que?....
    I'm only here cos I got on the wrong bus.

    Comment

    • #3
      So you've got an assignment which is marked with different weighting, but the overall grade is 16.8?, or 16 and 8?
      I'm only here cos I got on the wrong bus.

      Comment

      • #4
        Since the ration is 75/25% it is 3quarters and 1 quarter - or 4 quarters. So divide 16.8 by 4 = 4.2
        Multiply that by 3 = 12.6 for the first part and 1 for the 2 part = 4.2.
        But that doesn't make sense either

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        • #5
          Assuming .."Part A was worth 75% and Part B worth 5%."
          Should read Part A was worth 75% and Part B worth 25%.

          Then ......

          Part A is worth . 12.6
          Part B is worth .. 4.2

          Giving total grade16.8

          Simple math 75% + 25% = 100% .... 25% expressed as a fraction is 1/4 .. therefore divide final answer by 4 that will be B then multiply that by 3 to get A
          He who smiles in the face of adversity,has already decided who to blame

          Artificial intelligence is no match for natural stupidity

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          • #6
            Snap VC

            I was still typing while you were posting,wonder why they never put the ... therefore symbol on keyboards dunno if you were the same but at school we used three dots in the form of a triangle in equations
            Last edited by bearded bloke; 22-06-2012, 11:04 AM.
            He who smiles in the face of adversity,has already decided who to blame

            Artificial intelligence is no match for natural stupidity

            Comment

            • #7
              Can't be done! You don't have enough information. You know that 0.75(part A grade) + 0.25(part B grade) = 16.8. That gives you an equation with two unknowns, which doesn't have a unique solution.

              Knowing that the grades can be between 8 and 19 lets you figure out a range of possible values - you must have received between 16 and 19 for part A and between 10 and 19 for part B. For example, if you had 12 on part B you'd have 18 on part A, but you could also have 19 on part B and 16 on part A.

              I hope that helps and doesn't confuse you further!
              March is the new winter.

              Comment

              • #8
                That's not right as the grades range from 8 to 19 so it's not just a case of adding it up like that - will have a think and get back to you

                Sorry, this was aimed at the posts which said you'd got less than 8 in one of the segments not at the post directly above
                Last edited by Alison; 22-06-2012, 11:24 AM. Reason: Beaten to a post :)

                Some of us live in the past, always talking about back then. Some of us live in the future, always planning what we are going to do. And, then there are those, who neither look behind or ahead, but just enjoy the moment of right now.

                Which one are you and is it how you want to be?

                Comment

                • #9
                  Originally posted by bearded bloke View Post
                  Snap VC

                  I was still typing while you were posting,wonder why they never put the ... therefore symbol on keyboards dunno if you were the same but at school we used three dots in the form of a triangle in equations
                  Yes, we did three dots too. I'm still looking for a division sign on my keyboard!

                  Comment

                  • #10
                    OK, I'm with Eirish on this one, you don't have enough info but you can limit it down to one of these combinations:

                    16 for A and 19 for B or
                    17 for A and 16 for B or
                    18 for A and 13 for B or
                    19 for A and 10 for B

                    Whichever one, you did well

                    Some of us live in the past, always talking about back then. Some of us live in the future, always planning what we are going to do. And, then there are those, who neither look behind or ahead, but just enjoy the moment of right now.

                    Which one are you and is it how you want to be?

                    Comment

                    • #11
                      Originally posted by veggiechicken View Post
                      Yes, we did three dots too. I'm still looking for a division sign on my keyboard!
                      On excel isn't that / ?
                      q...................
                      I thought the . . symbol you are after was created by the predator?
                      Last edited by Mikey; 22-06-2012, 11:25 AM.
                      I'm only here cos I got on the wrong bus.

                      Comment

                      • #12
                        Originally posted by veggiechicken View Post
                        Yes, we did three dots too. I'm still looking for a division sign on my keyboard!
                        There you go ..
                        ÷

                        We use three dots for therefore in medical terminology. The symbol is there too, but I haven't time to look for it at the mo.
                        Granny on the Game in Sheffield

                        Comment

                        • #13
                          Originally posted by bearded bloke View Post
                          Snap VC

                          I was still typing while you were posting,wonder why they never put the ... therefore symbol on keyboards dunno if you were the same but at school we used three dots in the form of a triangle in equations
                          Our mutual friend would write down "e r g o"
                          Granny on the Game in Sheffield

                          Comment

                          • #14
                            I should have prefixed that with FYI BB! Really got to go now ......
                            Granny on the Game in Sheffield

                            Comment

                            • #15
                              Originally posted by Florence Fennel View Post
                              Originally posted by Florence Fennel View Post
                              Our mutual friend would write down "e r g o"
                              I should have prefixed that with FYI BB! Really got to go now ......
                              Why can't we have great post button
                              He who smiles in the face of adversity,has already decided who to blame

                              Artificial intelligence is no match for natural stupidity

                              Comment

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