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3 October, 02:38

A bag contains black beads and white beads in the ratio 7:4.

There are 42 black beads in the bag.

Work out how many beads there are altogether in the bag.

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  1. 3 October, 04:40
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    Step-by-step explanation:

    Ratio of black to white = 7:4

    Total ratio = 7 + 4 = 11

    Let the total number of beads be y

    Number of black bead = 42

    : 7/11 * y = 42

    7y/11 = 42

    Cross multiply

    7y = 42*11

    7y = 462

    y = 462/7

    y = 66

    Total beads is 66
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