One gallon of cleaning solution requires 6 oz of ammonia. If the maintenance department needs 120 gallons of solution to clean all of the floors, how much ammonia is needed?

A: 20 oz

B: 20 gallons

C: 720 oz

D: 720 gallons

Correct Answer: C

Rationale: To find the total amount of ammonia needed, multiply the amount of ammonia required for one gallon of solution by the total number of gallons needed. 6 oz of ammonia * 120 gallons = 720 oz of ammonia. Therefore, 720 oz of ammonia is needed to clean all the floors.

Question 2:

Translate the phrase 'Five less than twice the number' into a mathematical expression.

A: 5x-2

B: 2x-5

C: 2-5x

D: 5-2x

Correct Answer: B

Rationale: The phrase 'Five less than twice the number' means 2 times a number minus 5. In mathematical terms, this translates to 2x-5. Therefore, choice B is the correct expression that represents 'Five less than twice the number.'

Question 3:

A couple dining at a restaurant receives a bill for $38.40. They wish to leave a 15% gratuity. Which of the following is the estimated gratuity?

A: $6.00

B: $5.00

C: $4.00

D: $7.00

Correct Answer: A

Rationale: To calculate the 15% gratuity on a $38.40 bill, you multiply the bill amount by 0.15 (15%). $38.40 x 0.15 = $5.76. Rounding up, the estimated gratuity would be $6.00, which is closest to the correct answer A.

Question 4:

Lana has $60. She spends 80% of the money. She then invests the remaining amount and earns a profit of 80%. How much does she have now?

A: $21.60

B: $9.60

C: $86.40

D: $60.00

Correct Answer: A

Rationale: If Lana spends 80% of $60, she spends $48. She is left with $12. When she invests this remaining amount, and earns an 80% profit on $12, it amounts to $21.60 ($12 + 80% of $12). Therefore, Lana now has $21.60.

Question 5:

Which of the following percentages is equivalent to the fraction 5/8?

A: 160%

B: 65.25%

C: 62.50%

D: 1.60%

Correct Answer: C

Rationale: To convert a fraction to a percentage, you divide the numerator by the denominator, then multiply by 100. In this case, 5/8 = 0.625 * 100 = 62.50%. Therefore, choice C, 62.50%, is the correct percentage equivalent to the fraction 5/8.

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