Question

A number is two fifth times another number. If their sum is 70. Find the number

Answer 1

One Number = x
Second Number = 2/5x 

Sum = 70
 
 Therefore,
  
   x + 2x/5 = 70
 
  x/1+2x/5 = 70
 
 Taking LCM to be 5 , 

 5x/5 + 2x/5 = 70
 
7x /5 = 70

7x = 350

x = 350/7

x = 50

One Number = 50

Other Number = 2 x 50 / 5
                        = 100/5
                        = 20.