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Siew Yan had some red coloured beads and yellow coloured bead. The number of red coloured beads was 4/9 as many as the number of yellow coloured beads. After giving away 21 yellow beads, Siew Yan 2/3 as many red coloured beads as yellow coloured beads. How many red beads did siew yan have?

  • maths -

    r = 4/9 y
    r = 2/3 (y-21)

    4/9 y = 2/3 (y-21)
    4/9 y = 2/3 y - 14
    2/9 y = 14
    y = 63
    r = 28

    check:
    63-21 = 42.
    28 = 2/3 of 42

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