WorkKeys Workplace Applied Mathematics Questions and Answers 3 — Questions and Answers
Question 1: A power plant produces 12,500 MWh/day at 80% efficiency. How many MWh are delivered to the grid?
- 9,500 MWh
- 10,000 MWh (Correct answer)
- 10,500 MWh
- 11,000 MWh
Correct answer: 10,000 MWh
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?
- 2 years
- 3 years
- 4 years (Correct answer)
- 5 years
Correct answer: 4 years
$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?
- 5 days
- 6 days
- 7 days
- 8 days (Correct answer)
Correct answer: 8 days
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?
- $5.75
- $6.00
- $6.17
- $6.33 (Correct answer)
Correct answer: $6.33
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?
- 1,875 lbs
- 2,000 lbs
- 2,125 lbs (Correct answer)
- 2,250 lbs
Correct answer: 2,125 lbs
850 units × 2.5 = 2,125 lbs.
Question 6: A kitchen serves 280 customers: 60% order the special ($14.95), 40% order regular ($11.50 avg). What is total meal revenue?
- $3,556.00
- $3,673.60
- $3,799.60 (Correct answer)
- $3,892.00
Correct answer: $3,799.60
Special: 168 × $14.95 = $2,511.60. Regular: 112 × $11.50 = $1,288.00. Total: $3,799.60.
WorkKeys Workplace Applied Mathematics Questions and Answers 3
A power plant produces 12,500 MWh/day at 80% efficiency.
How many MWh are delivered to the grid?