SSC CGL 201911)If the radius of a right circular cylinder is decreased by 20% while its height is increased by 40%, then the percentage change in its volume will be:

Correct Option: B

10.4% decrease

Volume of right circular cylinder =\( \pi r^2 h;\)

Now,

\(r_1 = 0.8r;
h_1 = 1.4h\);

Volume of right circular cylinder =\( \pi (0.8h)^2 \times 1.4h = 0.896\pi r^2 h;\)

Decrement in volume = \(\pi r^2 h - 0.896\pi r^2 h = 0.104\pi r^2 h\);

Percentage decrement in volume =\( \frac{0.104\pi r^2 h}{\pi r^2 h} \times 100 = 10.4%;\)

therefore The correct answer is option B.

SSC CGL 201912)Monika spends 72% of her income. If her income increases by 20% and savings increase by 15%, then her expenditure increases by: (correct to 1 decimal place)

Correct Option: C

21.9%

SSC CGL 201913)The price of oil is increased by 20%. However, its consumption decreased by \(8\frac{1}{3}\)% . What is the percentage increase or decrease in the expenditure on it?

Correct Option: A

Increase by 10%

SSC CGL 201914)If 25% of half of x is equal to 2.5 times the value of 30% of one-fourth of y, then x is what percent more or less than y?

Correct Option: B

50% more

SSC CGL 201915)In an examination, A obtained 10% more marks than B, B obtained 20% more marks than C and C obtained 32% less marks than D. If A obtained 272 marks more than C, then the marks obtained by B is:

Correct Option: C

1020

SSC CGL 201916)If 60% of a number is 120 more than 20% of the number, then 28% of the number is less than \(33\frac{1}{3}\)% of the number by:

Correct Option: C

16

SSC CGL 201917)In a class, \(83\frac{1}{3}\)% of the number of students are girls and the rest are boys. If 60% of the number of boys and 80% of the number of girls are present, then what percentage of the total number of students in the class are absent?

Correct Option: C

\(23\frac{1}{3} \)

SSC CGL 201918)A spends 65% of his income. His income is increased by 20.1% and his expenditure is increased by 25%. His savings:

Correct Option: A

Increase by 11%

SSC CGL 201919)If the price of petrol increases by 19%, and Sunita intends to spend only an additional 12% on petrol, by what percent should she reduce the quantity of petrol purchased (nearest to an integer)?

Correct Option: D

8

SSC CGL 201920)A is 25% more than B and B is 40% less than C. If C is 30% more than D, then by what percent is A less than D?

Correct Option: B

2.5

Let B be 100, then A will be 125 ;

Now; \( {60 \over 100}C = 100 \) then; \(C = {500\over 3}\) ;

Also, \({130\over 100}D = C = {500\over 3}\) ; then \(D= {5000 \over 3 \times 13}\) ;

\({A \over D } \times 100 = {125 \times 3 \times 13\over 5000}\times 100= {195\over 2}\)%

Since we have to calculate less than percentage it will be \(100-{195\over 2} = 2.5\) %

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