Percentages Quiz Set 016 | Maths Aptitude Quiz Questions and Mock Test on Percentages Set 16 | mock tests for Bank PO, SSC Exams, SO Clerical Exam, GATE Exam, LIC AO, GIC AO, etc.

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Question 1

The number of online customers increased from 1850 to 3575. What is the percentage increase?

$93{9/37}$ %.

$96{31/36}$ %.

$87{20/39}$ %.

$91{4/13}$ %.

Soln.
Ans: a

The increase is 3575 - 1850 = 1725. The percentage increase is $1725/1850$ × 100 = ${3450/37}$, which is same as: $93{9/37}$.

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Question 2

A sample of alcohol has 60% water, and another sample has 80% water. If equal volumes of both the samples are combined, what is the percentage of water in the new sample?

70 %.

72 %.

68 %.

74 %.

Soln.
Ans: a

If 100 units of both alcohol are combined, there will be 140 units of water in 200 units of the new sample. The percentage of water is $140/200$ × 100 = 70%.

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Question 3

The sum of two numbers is 1610. One of them is 130% of the other. The smaller number is?

700.

710.

690.

720.

Soln.
Ans: a

Let the numbers be x and ${130x}/100$. The sum is x + ${130x}/100$ which is same as ${230x}/100 = 1610$. Solving we get the smaller number x = 700.

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Question 4

If 7% of A + B = 11% of A - B, then what percent of B is A?

$4{1/2}$ %.

$5{1/2}$ %.

$3{1/2}$ %.

$3{3/4}$ %.

Soln.
Ans: a

We have been given 7% of A + B = 11% of A - B, so ${A + B}/{A - B}$ = $11/7$. By componendo and dividendo, ${(A + B) + (A - B)}/{(A + B) - (A - B)}$ = ${11 + 7}/{11 - 7}$, which gives $A/B$ = $18/4$ = ${9/2}$, which is same as: $4{1/2}$%

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