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28 April, 22:55

Red and grey bricks were used to build a decorative wall. The number of red bricks/number of grey bricks was 5/2 There were 140 bricks used in all. How many red bricks were used?

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  1. 28 April, 23:19
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    5/2 = 5:2

    Lets take 5:2 as 5x and 2x.

    5x + 2x = 140

    7x = 140

    x = 140/7

    x = 20

    So, 5x = 5x20 = 100 red bricks

    and, 2x = 2x20 = 40 grey bricks.

    100 + 40 = 140 bricks

    So, to build the decorative wall, 100 red bricks and 40 grey bricks were used.
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