Question

A number is 2/5 times another number . If their sum is 70. Find the number.

Answer 1

x+2/5x=70
7x/5=70
x=70*5/7
x=50
so..first no. 50
second no. =2/5*50=20

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Answer 2

let's consider the number is x,and the another number is x*2/5=2x/5
according to the question,

x+2x/5=70
or,7x=350
or,x=50
 
so,we can tell that the number is 50
and the second number is 50*2/5=20