Question

The ratio between the present age of son,mother,father and grandfather is 2:7:8:12 respectively. The average age of the son and mother is 27year. how much will the mother be after 7years?
(a)40year
(b) 41year
(c)48years
(d)42years​

Answer 1

Answer:

49years

Step-by-step explanation:

ratio=2:7:8:12=2x,7x,8x,12x

average=sum of observations/no. of observations

A.T.Q,

(7x+2x)/2=27

7x+2x=54

9x=54

x=6

mother current age=7×6=42

mother age after 7 years=42+7=49years