Mettl Quantitative Aptitude 3

Question 1

A pipe can fill a tank in 12 hours. Another pipe can empty it in 18 hours. If both pipes are open simultaneously, how many hours will it take to fill the empty tank?

Accepted Answer

36 hours

Answer

Net fill rate = 1/12 - 1/18 = 1/36, so the tank fills in 36 hours.

Question 2

The simple interest on $4,000 at 6% per annum for 3 years is:

Accepted Answer

$720

Answer

SI = P × R × T / 100 = 4000 × 6 × 3 / 100 = $720.

Question 3

In a class of 40 students, the average score is 72. If the top 10 students have an average of 90, what is the average of the remaining 30 students?

Accepted Answer

66

Answer

Total = 40×72 = 2880; top 10 total = 900; remaining = (2880−900)/30 = 66.

Question 4

A shopkeeper marks a product 40% above cost price and offers a 20% discount. What is his profit percentage?

Accepted Answer

12%

Answer

SP = 140% × 80% = 112% of CP, giving a 12% profit.

Question 5

If 3x + 7 = 22, what is the value of 6x − 4?

Accepted Answer

26

Answer

3x = 15, so x = 5; then 6(5) − 4 = 26.

Mettl Practice Test

Mettl Practice Test

Mettl Quantitative Aptitude 3