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Question

Answer

Cost

Calculator -> u + 18

Book -> u + 10

File -> u

 

Cost of 9C, 9B, 9F -> 9 × (u + 18 + u + 10 + u) = 27u + 252

 

27u + 252 = 576

27u = 324

u = 12

Each file cost $12

If he were to spend $576 all on files, number of files -> 576 ÷ 12 = 48

1 Reply 1 Like

Thanks. Your explanation very clear.

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You are welcome.

I try to make my solution easy to understand. 🙂

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9 calculators + 9 files + 9 books ——- 576
1 calculator + 1 file + 1 books ——- 64
file + 18 ——- calculator
book + 8 ——- calculator
book ——- file + 18 – 8 = file + 10
file + 18 + 1 file + file + 10 = 3 files + 28 ——- 64
1 file ——- (64 – 28)/3 = 12
576/12 = 48

Ans : 48 files.

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