Question

Rewrite the following using a letter:

i. The sum of a certain number and 3. 

ii. The difference is obtained by subtracting 11 from another number. 

iii. The product of 15 and another number. 

iv. Four times a number is 24.

Answer 1

i. Let the number be x. 

∴ x + 3 represents the sum of a certain number x and 3.

ii. Let the number be x. 

∴ x – 11 represents the number obtained by subtracting 11 from another number x.

iii. Let the number be x. 

∴ 15x represents the product of 15 and another number x.

iv. Let the number be x. 

∴ 4x = 24 represents four the product of a number x four times.