Question:Two numbers are less than a third number by` 30%`and `37%` respectively. How much percent is the second number less than the first ? 

A `10%` 
B `7%` 
C `4%` 
D `3%` 

+ Answer
A 

+ Explanation
Let, third number be x. Then,

First number`= 70% of x = (7x)/10,`

Second number`= 63% of x = (63x)/100`

Required Percentage 

`= ((7x)/100 xx 10/(7x) xx 100)%`

`= 10%`

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Irin Moni

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