Question

The difference between the ages of two persons is 10 years. Fifteen years ago, if the elder one was twice as old as the younger one, find their present ages

Answer 1

The elder’s age is 20( 15 yrs back 5)

The younger ones age is 10( 15 yrs back not born)

Answer 2

Answer:

Step-by-step explanation:

Let, the first one's age is a years

second one's age is ( a + 10 ) years

so, 15 years ago,

    (a + 10 -15) = 2 * (a - 15)

=> a + ( -5 ) = 2a - 30

=> 2a - a = -5 + 30

=> a = 25

so, the elder one's age is ( a + 10 ) years

                                          = 25 + 10   ''

                                          = 35 years