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Learn POLICE SI MCQs with answers [Page 14 of Department 39]
132) The population of a city is 35000. On an increase of 6% in the number of men and an increase of 4% in the number of women, the population would become 36760. What was the number of women initially?
133) The length, breadth and height of a room in the shape of a cuboid are increased by 10%, 20% and 50% respectively. Find the percentage change in the volume of the cuboid.
134) The price of rice falls by 20%. How much rice can be bought now with the money that was sufficient to buy 20 kg of rice previously?
(A) 5 kg
(B) 15 kg
(C) 25 kg
(D) 30 kg
Correct Answer - Option
(C)
Explanation :
Let Rs. 100 be spend on rice initially for 20 kg.
As the price falls by 20%, new price for 20 kg rice,
= (100 - 20% of 100) = 80
New price of rice = 80/20 = Rs. 4 per kg.
Rice can bought now at = 10/04 = 25 kg.
137) Vicky's salary is 75% more than Ashu's. Vicky got a raise of 40% on his salary while Ashu got a raise of 25% on his salary. By what percent is Vicky's salary more than Ashu's?
(A) 96%
(B) 51.1%
(C) 90%
(D) 52.1%
Correct Answer - Option
(A)
Explanation :
Let Ashu's salary = 100; Ashu's salary after rise = 125
Then Vicky's salary = 175
Vicky's salary after rise of 40% = 245
[As 10% of Vicky's salary is 17.5 then 40% = 17.5 × 4 = 70]
Difference between Vicky's salary and Ashu's salary = 245 - 125 = 120
% more Vicky's salary than Ashu's = (120×100)/125=96%
138) An ore contains 25% of an alloy that has 90% iron. Other than this, in the remaining 75% of the ore, there is no iron. How many kilograms of the ore are needed to obtain 60 kg of pure iron?
139) In the recent, climate conference in New York, out of 700 men, 500 women, 800 children present inside the building premises, 20% of the men, 40% of the women and 10% of the children were Indians. Find the percentage of people who were not Indian?
140) One evening before sunset Rekha and Hema were talking to each other face to face. If Hema's shadow was exactly to the right of Hema, which direction was Rekha facing?
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