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Mr Tan had a box of marbles. 2/3 of the marbles were blue and the rest were yellow. He gave his son 4/5 of the blue marbles and 3/4 of the yellow marbles. If he had 39 marbles left, how many marbles did he have at first?

  • maths - ,

    X = total mrbles.
    2x/3 Blue marbles.
    x/3 yel. marbles.

    X - 4/5(2x/3) - 3/4(x/3) = 39 Marbles.
    X - 8x/15 - x/4 = 39.
    Multiply both sides by 60:
    60x - 32x - 15x = 2340.
    60x - 47x = 2340.
    13x = 2340.
    X = 180 Marbles.

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