The ratio of Rashmi's age to her father's age is 3:5 and the ratio of her age to her son's age is 5 : 1. Four years ago these ratio were 13 : 23 & 13 : 1 respectively. The ratio of the age of the grandfather to that of the grandson 20 years from now will be?
Answer & explanation
Correct answer: option 4
Father : Rashmi : son
5 : 3
5 : 1
25 : 15 : 3 (at present)
↓ - 2 unit
23 : 13 : 1 (Four years before)
2 unit = 4
1 unit = 2
Grandfather's present age = 25 x 2 = 50
Grandson's present age = 3 x 2 = 6
20 years from now F = 50+20 = 70
S = 6 +20 = 26
F : S = 70 : 26 = 35: 13