West B Test Mathematics 4

Question 1

A car travels 240 miles in 4 hours. What is its average speed in miles per hour?

Accepted Answer

60 mph

Answer

Average speed = distance ÷ time = 240 ÷ 4 = 60 mph.

Question 2

What is the greatest common factor (GCF) of 24 and 36?

Accepted Answer

12

Answer

Factors of 24: 1,2,3,4,6,8,12,24; factors of 36: 1,2,3,4,6,9,12,18,36; GCF = 12.

Question 3

A class of 30 students has a ratio of boys to girls of 2:3. How many girls are in the class?

Accepted Answer

18

Answer

The ratio 2:3 means girls = 3/(2+3) × 30 = 3/5 × 30 = 18.

Question 4

Simplify: √144

Accepted Answer

12

Answer

12 × 12 = 144, so √144 = 12.

Question 5

If a shirt originally costs $60 and is on sale for 30% off, how much does the customer pay?

Accepted Answer

$42

Answer

Discount = 30% × $60 = $18; sale price = $60 − $18 = $42.

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