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There are some coloured rubber bands in a box. 3/8 of them are blue, 1/4 of them are re and 5/6 of the remainder are yellow. There are 20 yellow rubber bands. Find the total number of rubber bands in the box.

 May 12, 2021
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5/6 ths of  (1 - 3/8 - 1/4)   is to 20    as   1  is to  x

5/6 ( 3/8)  / 20  = 1/x

15 / 960 = 1/x

x = 64     in the box

 May 12, 2021

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