I went into a furniture shop in order to buy a picture. The sales man told me— "The picture is five times the cost of that ashtr

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问题 I went into a furniture shop in order to buy a picture. The sales man told me— "The picture is five times the cost of that ashtray, the chair is 30 times the cost of the ashtray, the table is 4 times the cost of the chair, you can buy the lot for £ 312." What was the price of the picture?

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答案£ 10.

解析 (假设ashtray的价格为X,那么picture的价格为5X,chair的价格为30X,table的价格为120X,已知总价为312英镑,所以得出式子156X=312,X的值为2,picture的价格为5X,即10英镑。)  
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