Word problems

Word problems

Examples:

• When 5 is added to a certain number, the result is 6. Find the number.
• I think of a number and subtract 7 from it. The result is 10. Find the number.
• Find the number which when multiplied by 4, the result is 36.
• When a certain number is divided by 15, the result is 6. Find the number.

Therefore, the number = 6-5 = 1

Calculation:

Let number be x, then,

x + 5 = 6

subtract 5 from both sides:

x + 5 – 5 = 6 – 5

x + 0 = 1

Therefore, x = 1.

CLASS ACTIVITY: Simplify the following:

4. Find the number which when 3 is subtracted from, the result is 4.
5. Kolade was given a certain amount of money as allowance. He spent £405 and he has £395 left. How much did he have left?

• Find the number which when multiplied by ⁵/₂, it gives 10

5. When 4 is multiplied by a certain number and divided by 3, the result is 5. Find the number?

PRACTICE QUESTIONS

• Simplify the following

1. (+20) ÷ (-10)
2. (-14) ÷ (-7)

• (+60) ÷ ((-3) x (-5))

1. ((-2) x (-12)) ÷ (+6)²
2. (-8) x (+5) ÷ (-10)

ASSIGNMENT

• Copy and complete the following

• I think of a number, added 12 to it and the result gives 20. What number did I think of?
• When 4is subtracted from 5 times a certain number, the result is 26. What is the number?
• Three quarters of a certain number is 18. Find the number.
• A man borrowed a certain amount from a cooperative society and was to pay back in 12 equal installments. If each payment is £1500, what is the sum of money borrowed?