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| Thread ID: 108704 | 2010-04-08 04:44:00 | Maths Problem | bk T (215) | PC World Chat |
| Post ID | Timestamp | Content | User | ||
| 874225 | 2010-04-08 07:55:00 | My bad. You're right bk_T : B= x - 3, not x + 3. So my answer for their times is totally wrong. Back to the drawing board! |
catspyjamas (15614) | ||
| 874226 | 2010-04-08 08:15:00 | pcuserwinvista is correct :thumbs: | Renmoo (66) | ||
| 874227 | 2010-04-08 10:19:00 | B+P+M=24 B+3=P 3M=B Then I rearranged the equasions to x+y+z=a: B+P+M=24 B-P=-3 3M-B=0 Then just bang them into the calculator: B=9 P=12 M=3 Simple!!!!!! Edit: Oh its already been solved lol. I should probably read the whole thread before replying :D |
xyz823 (13649) | ||
| 874228 | 2010-04-08 10:26:00 | Don't worry, it's happened to me before. :blush: | pcuser42 (130) | ||
| 874229 | 2010-04-09 11:59:00 | B+P+M=24 .... Then just bang them into the calculator: B=9 P=12 M=3 Simple!!!!!! Banging them in a calc is not showing the working, well not for School Cert anyway... Bill = Peter - 3 Mike = Bill / 3 24 = Peter + Bill + Mike 24 = P + (P-3)+ 1/3(P-3) 24 = 2P - 3 + 1/3(P-3) 24 = 2P - 3 + 1/3P - 1 24 = 2P - 4 + 1/3P 28 = 2P +1/3P 28 = 2 1/3P 28 = 7/3P 84 = 7P 12 = P (Peters Time) Peter = 12 Bill = 9 Mike = 3 Kickin' it Old School... :p |
Ferg (2559) | ||
| 874230 | 2010-04-09 12:07:00 | Thank you folks.:thanks I'm happy now.:thumbs: |
bk T (215) | ||
| 874231 | 2010-04-09 15:30:00 | Should be the total time taken for the 3 boys to complete the raceIf this is the case, then every answer so far is wrong, because the total time taken for the three boys to complete the race is the same as the time taken for the slowest boy to complete it (i.e. Peter) - *not* the sum of the three boys' times as everyone else seems to think. In light of that: Peter's time (P) = 24 Bill's time (B) = P - 3 Michael's time (M) = B / 3 Therefore: P = 24 (the question tells us this) B = P - 3 (substitute the value for P) B = 24 - 3 (simplify) B = 21 M = B / 3 (substitute value for B) M = 21 / 3 (simplify) M = 7 So the final times are actually: Peter: 24 mins Bill: 21 mins Michael: 7 mins One would have to wonder if Michael has been experimenting with something he shouldn't? |
Erayd (23) | ||
| 874232 | 2010-04-09 16:49:00 | Banging them in a calc is not showing the working, well not for School Cert anyway... It is for NCEA... |
roddy_boy (4115) | ||
| 874233 | 2010-04-10 02:50:00 | Banging them in a calc is not showing the working, well not for School Cert anyway... As roddy_boy said, it actually is valid working. |
pcuser42 (130) | ||
| 874234 | 2010-04-10 05:38:00 | For NCEA, "Quite fast", "Medium", "Slow", or "kwik" will probably get credits since to penalise students for being dorks would be discriminatory, judgemental and elitist. | R2x1 (4628) | ||
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