1.
If 12% of x is equal to 6% of y, then 18% of x will be equal to how much per cent of y?
• A.
7%
• C.
11%
• B.
9%
• D.
None of these
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Explanation :
We have, 12% of x = 6% of y
2% of x = 1% of y
(2 x 9)% of x = (1 x 9)% of y
18% of x = 9% of y
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2.
In a shipment of 120 machine parts, 5 per cent were defective. In a shipment of 80 machine parts, 10 per cent were defective. For the two shipments combined, what per cent of the machine parts were defective?
• A.
6.5
• C.
7.5
• B.
7.0
• D.
8.0
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Explanation :
 14 out of 200 machine parts were defective, i.e., 7%
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3.
A number is increased by 20% and then decreased by 20%, the final value of the number.
• A.
does not change
• C.
increases by 4%
• B.
decreases by 2%
• D.
decreases by 4%
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Explanation :
Here, x = 20 and y = -20
The net % change in value =   x + y +
 xy 100
%
=   20 - 20 -
 20 x 20 100
% or -4%
Since the sign is negative, there is decrease in value by 4%.
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4.
? x 15 = 37.5% of 220
• A.
5.5
• C.
6.5
• B.
7.5
• D.
None of these
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Explanation :
Let x x 15 = 37.5% of 220
15x =
 37.5 100
x 220
x =
 37.5 x 220 15 x 100
= 5.5
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5.
Three papers where set in an examination and the maximum marks per paper were in the ratio of 1 : 2 : 2 respectively. If a student obtained 50% in the first paper, 60% in the second, and 65% in the third, what percent did he obtain overall?
• A.
58.3%
• C.
33.33%
• C.
66.66%
• D.
60%