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(b) If x = 3, then 3x – 5 = ……….
(c) If x = 1 and y = 2, then 2x + 3y = ……….
(d) If 10x – 6 = 14, then x = ……….
(e) 4 less than a number x = ……….

3. Write the following using numbers, literals and signs of basic operations. State what
each letter represents:

(i) The diameter of a circle is twice its radius.

(ii) The area of a rectangle is the product of its length and breadth.

4. Write the following using numbers, literals and signs of basic operations:

(i) The sum of 6 and x.

(ii) 3 more than a number y.

5. Identify the operations (addition, subtraction, division, multiplication) in forming
the following expressions and tell how the expressions have been formed.

(a) z + 1, z – 1, y + 17, y – 17

(b) 17y, y / 17, 5z

6. Think of a number. Multiply by 5. Add 6 to the result. Subtract y from this result.
What is the result?

7. One pencil costs Rs 2 and one fountain pen costs Rs 15. What is the cost of x
pencils and y fountain pens?

8. The teacher distributes 5 pencils per students. Can you tell how many pencils are
needed, given the number of students? (Use s for the number of students.)

9. (a) Given Munnu’s age to be x years, can you guess what (x – 2) may show?

Can you guess what (x + 4) may show? What (3x + 7) may show?
(b) Given Sara’s age today to be y years. Think of her age in the future or in the past.

What will the following expression indicate? Y + 7, y – 3, ,

10.Complete the table and by inspection of the table find the solution to the equation m
+ 10 = 16.

m 1 2 3 4 5 6 7 8 9 10 — — —