Question

11 years ago, the mean age of gita and sita was 16 years. If today average age of gita, sita and rita is 25 years, what will be age of rita after 3 years?​

Answer 1

Answer:

Sum of age of Sita and Geeta = average × 2 = 30 × 2

⇒ S + G = 60 ----(1)

⇒ Sum of age of Geeta and Rita = average × 2 = 28 × 2

⇒ G + R = 56 ----(2)

⇒ Sum of age of Sita and rita = average × 2 = 32 × 2

⇒ S + R = 64 ----(3)

Now, subtracting (2) from (1) we get

⇒ S – R = 4 ----(4)

Now, adding (3) and (4) we get,

⇒ 2S = 68

⇒ S = 34

Now,

⇒ R = 64 – S = 64 – 34 = 30

⇒ G = 56 – R = 56 – 30 = 26

∴ age of Sita, Gita and Rita is 34, 26 and .30 respectively