Wednesday, October 12, 2016

Primary maths problem

There is a sum of $425 to be shared between bruce and charlie. bruce spends 2/3 of his money and charlie spends 1/4 of his money. In the end, charlie has 2 times more money than bruce. How much does charlie have at the end?
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1 comment:

  1. Eric HoOctober 12, 2016 at 6:01 PM

    Solution:

    Let x be the initial sum for charlie and y be bruce. Convert all y into x.

    x + 3/8x + 3/4x = 425
    17/8 x = 425
    x=200
    Therefore, y=425-200=225
    At the end, 200 * 3/4 = 150 is left for charlie.

    Let's find out y using simultaneous equation. Convert all x into y.
    y + 2/3y +2/9y = 425
    17/9y = 425
    y=225

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