A photograph mearsuring 5' wide*7' long must be reduced in size to fit a space 4 inches long in an a

A photograph mearsuring 5' wide*7' long must be reduced in size to fit a space 4 inches long in an a

题目
A photograph mearsuring 5' wide*7' long must be reduced in size to fit a space 4 inches long in an advertising brchure.How wide must the space be so that the picture remains in proportion?
答案
要把大照片等比例变小塞到广告的册子里
长是7:4
宽也必须是7:4
所以答案是5/7*4=20/7
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