Nalini’s younger brother is 12 years old. If the ratio of the age of Nalini to that of her brother is 7 : 6, then what will be ratio in their ages 6 years hence?

10 : 9  13 : 12 17 : 15 10 : 6

10 : 9

Brother = 12 yrs Nalini : Brother    7    :   6 ⇒ 6 units = 12 ⇒ 1 unit = 2 ⇒ Nalini's age = 7 x 2 = 14 ⇒ Both ages 6 yrs hence = 14 + 6 : 12 + 6 ⇒ 20 : 18 = 10 : 9