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Question

Got stuck half way through this question. Can someone help?

Answer

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Jonathan ‘s money ——- 5u
3 pairs of shorts ——- (1/5) x 5u = 1u
9 pairs of shorts ——- 3u

5u – 1u = 4u
4 singlets + 4 t-shirts ——- (1/2) x 4u = 2u
2 singlets + 2 t-shirts ——- 1u
6 singlets + 6 t-shirts ——- 3u

1 singlet ——- (1 t-shirt)/3
3 singlets ——- 1 t-shirt

1 pair of shorts ——- 1 singlet + 10
9 pairs of shorts——- 9 x (1 singlet + 10) = 9 singlets + 90
6 singlets + 6 t-shirts ——- 6 singlets + 18 singlets = 24 singlets
24 singlets ——- 9 singlets + 90
24 – 9 = 15 singlets ——- 90
1 singlet ——- 90/15 = 6
1 pair of shorts ——- 6 + 10 = 16

Ans : $16.

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Try to let 1 singlet be 1 u and work from there. 

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