Question

the average age of p, q, r, s five years ago was 45 years. by including t, the present average age of all the five is 49 years. the present age of t is?

Answer 1

Average Age  five year ago = (Sum of ages of  P  , Q , R , S five year ago)/4

45 = (Sum of Ages of P , Q , R , S five years ago )/4

Sum of Ages of P , Q , R , S five years ago  = 4 × 45 = 180

After five years that is present scenario , Sum of Ages of P , Q , R , S = 180 + 20   [ 5 years for each ]

⇒ 200 years

let present age of t = x

⇒ 49 = (sum of ages of P , Q , R , S , T ) /5

⇒ 49 = (200 + x )/ 5

⇒ 245 = 200 + x

⇒ x = 245 - 200 = 45

hence present age of T = 45 years

Answer 2

Refer to the attachment mate !