Question

sun of two persons age is 30 .Difference in their age is 10.Then what are their ages?

Answer 1

Answer:

Ages are 20 yrs and 10 yrs

Step-by-step explanation:

Let x and y be the ages of the two persons.

Given, sum of ages = 30

=> x + y = 30 ------------- [1]

Given, difference of ages = 10

=> x - y = 10 ------------- [2]

Solve [1] and [2] by addition,

x + y = 30

x - y  = 10

-------------

2x = 40

=> x= 40/2 = 20.

Substitute value of x in [1]

20 + y =30

=> y = 30 - 20 = 10

Thus the ages are 20 yrs and 10 yrs