OC Mathematical Reasoning 3

Question 1

A number is multiplied by 6 and then 15 is subtracted to give 45. What is the number?

Accepted Answer

10

Answer

6n − 15 = 45, so 6n = 60, giving n = 10.

Question 2

What is 15% of 200?

Accepted Answer

30

Answer

15% of 200 = 0.15 × 200 = 30.

Question 3

A square has a perimeter of 36 cm. What is its area?

Accepted Answer

81 sq cm

Answer

Side = 36 ÷ 4 = 9 cm, Area = 9² = 81 sq cm.

Question 4

What comes next in the pattern: 2, 5, 10, 17, ___?

Accepted Answer

26

Answer

The differences between consecutive terms increase by 2 each time (3, 5, 7, 9...), so 17 + 9 = 26.

Question 5

If it takes 5 workers 8 days to complete a job, how many days would 10 workers take?

Accepted Answer

4

Answer

10 workers is double, so they take half the time: 8 ÷ 2 = 4 days.

OC - Opportunity Class Test Practice Test