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Simple maths question help

This topic has 2 member replies
GMAT? Senior | Next Rank: 100 Posts Default Avatar
Joined
29 Sep 2006
Posted:
46 messages

Simple maths question help

Post Thu Dec 21, 2006 8:15 am
Elapsed Time: 00:00
  • Lap #[LAPCOUNT] ([LAPTIME])
    In a weight lifting competition, the total weight of Joe's two lifts was 750 pounds. If twice the wieght of his first lift was 300 pounds more than the weight of his second lift. What was the weight of his first lift?

    Let A be the weight of his first lift:

    2A + A + 300 = 750

    3A = 1050

    A = 350......which is the right answer but I'm unsure whether my working out is correct.

    Thanks all.

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    thankont Senior | Next Rank: 100 Posts
    Joined
    15 Dec 2006
    Posted:
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    Post Thu Dec 21, 2006 9:56 am
    A --> 1st. B--> 2nd.
    A+B=750
    2A=300+B => B=2A-300 subst. into first eqn. so we have
    A+2A-300=750 => A=350

    bluestocking Newbie | Next Rank: 10 Posts Default Avatar
    Joined
    29 Dec 2006
    Posted:
    7 messages
    Post Sat Dec 30, 2006 1:05 pm
    alternatively

    x = first lift
    750 - x = second lift

    therefore
    2x = (750-x) + 300
    2x + x = 750 + 300 ----> 3x = 1050

    x = 350

    helpful hint : try to work with as few variables as possible.

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