WorkKeys Workplace Applied Mathematics Questions and Answers 3

Question 1

A power plant produces 12,500 MWh/day at 80% efficiency. How many MWh are delivered to the grid?

Accepted Answer

10,000 MWh

Answer

12,500 × 0.80 = 10,000 MWh.

Question 2

A company saves $2,400/year switching to LED lighting. Installation cost was $9,600. In how many years does it break even?

Accepted Answer

4 years

Answer

$9,600 ÷ $2,400 = 4 years.

Question 3

A project requires 480 labor hours. 8 workers each work 8-hour days. How many days will it take?

Accepted Answer

8 days

Answer

Daily hours: 8 × 8 = 64 hr/day. Days: 480 ÷ 64 = 7.5 → 8 days (rounded up).

Question 4

Inventory purchases: 100 units@$5.00, 200 units@$6.00, 300 units@$7.00. What is the weighted average cost per unit?

Accepted Answer

$6.33

Answer

Total cost: $3,800. Total units: 600. Average: $3,800 ÷ 600 = $6.33.

Question 5

A water plant uses 2.5 lbs of chlorine per 1,000 gallons treated. It treats 850,000 gallons/day. How many lbs of chlorine are needed?

Accepted Answer

2,125 lbs

Answer

850 units × 2.5 = 2,125 lbs.

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