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.

A bus travels at v km per hour. It is going from Delhi to Jaipur. After the bus has travelled 5 hours, Jaipur is still 20 km away. What is the distance from Delhi to Jaipur?

Subtract:

(a) 12y from 19y

(b) 6z from 5z

(c) 10p from 20p

(d) 13m from 23m

(e) 48n from 50n

Solve:

(a) 6x + (9x − 2x)

(b) 11y + 2y + 3x

(c) 11z + 3z + z

(d) 8ab + (−3ab)

(e) 3x − 4x + 7x

(f) 35b − (16b + 9b)

(g) (9a − 3a) + 4a