AIT Mathematics for Trades 2

Question 1

A pipe must be cut to exactly 2 feet 9 inches. Expressed in inches, how long is this cut?

Accepted Answer

33 inches

Answer

2 feet = 24 inches, plus 9 inches = 33 inches total.

Question 2

A tradesperson earns $24.50 per hour and works 38.5 hours in a week. What is the gross pay?

Accepted Answer

$943.25

Answer

$24.50 × 38.5 = $943.25.

Question 3

A circular duct has a diameter of 8 inches. What is its cross-sectional area? (Use π ≈ 3.14)

Accepted Answer

50.24 sq in

Answer

Radius = 4 in; Area = π × r² = 3.14 × 16 = 50.24 sq in.

Question 4

On a blueprint with a scale of 1:50, a wall measures 3.5 cm. What is the actual length of the wall in meters?

Accepted Answer

17.5 m

Answer

3.5 cm × 50 = 175 cm = 1.75 m — wait, that equals 1.75 m. Re-check: 3.5 × 50 = 175 cm = 1.75 m.

Question 5

A container holds 45 gallons of fluid. If 1 gallon ≈ 3.785 liters, approximately how many liters does it hold?

Accepted Answer

170.3 L

Answer

45 × 3.785 = 170.325 ≈ 170.3 liters.

(AIT) Apprenticeship and Industry Training Practice Test