Mohini is x years old. Express the following in algebraic form:

(i) three times Mohini's age next year.

(ii) four times Mohini's age 3 years ago.

(iii) the present age of Mohini's uncle, if his uncle is 5 times as old as Mohini will be two years from now.

Mohini's present age = x years.

(i) Mohini's age next year = (x + 1) years.

Three times this = 3(x + 1) years.

(ii) Mohini's age 3 years ago = (x − 3) years.

Four times this = 4(x − 3) = (4x − 12) years.

(iii) Mohini's age 2 years from now = (x + 2) years.

Uncle's age = 5(x + 2) = (5x + 10) years.