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Look at the 6 boxes (3 yellow, 3 pink) on the far right, they represented 2/5 of the original sum of money.

Likewise, the 6 coloured boxes in the middle represented another 2/5 of the original sum.

Thus, the remaining (books + 2 boxes) represented 5/5 – 2/5 – 2/5 = 1/5 of the original sum of money.

 

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crayons ——- 40u
2/5 of her original sum of money ——- 30u
1/5 of her original sum of money ——- 30u/2 = 15u
5/5 of her original sum of money ——- 5 x 15u = 75u
books ——- 75u – 40u – 30u = 5u
40u – 5u = 35u ——- 28
1u 28/35 = 0.8
30u ——- 30 x 0.8 = 24
 
Ans : $24.
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Follow steps #1 to #7

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