Question

Rewrite the following using a letter.
(1) The sum of a certain number and 3.
(2) The difference obtained by subtracting 11 from another number.
(3) The product of 15 and another number.
(4) Four times a number is 24.

Answer 1

(1)
Let the certain number be x.

∴ Sum of a certain number and 3 = x + 3

(2)
Let another number be x.

∴ Difference obtained by subtracting 11 from another number = x − 11

(3)
Let another number be x.

∴ Product of 15 and another number = 15 × x = 15x

(4)
Let the number be x.

Four time a number = 24

∴ 4 × x = 24

⇒ 4x = 24