F2 Math (Chapter 13)

Question

A large sample of water containers were tested. It is found that 4 out of 500 water containers were faulty. How many water container are expected to be faulty in a batch of 2375 water containers ?

请问这题怎么做？

Answer 1

用比例
500 water containers
4 : 500（约减）
1 : 125
意思是125个里面1个会坏

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然后找出2375与125的倍数
2375 除 125 = 19倍

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125 x 19 = 2375
所以125里面一个会坏，2375里面19个会坏
 

Comments

好的，谢谢