UPSC CDS/OTA

Percentage

Mathematics

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Percentage

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Questions

30

Time

30 min

Marks

30

Solutions

All inline

Q1When 40% of a number A is added to another number B, B becomes 125% of its previous value. Then which of the following is true regarding the values of A and B?MediumSolve →Q2600 students took the test on Physics and Chemistry. 35% students failed in Physics and 45% students failed in chemistry and 40% of those who passed in Chemistry also passed in physics, then how many students failed in both?MediumSolve →Q3Mr. Ram is worried about the balance of his monthly budget. The price of petrol has increased by 50%. By what percent should he reduce the consumption of petrol so that he is able to balance his budget?MediumSolve →Q4In a physical measurement, by mistake Shyam gave his height as 25% more than normal. In the interview panel, he clarified that his height was 5 feet 5 inch. Find the percentage correction made by the candidate from his stated height to his actual height.MediumSolve →Q5Sachin wanted to subtract 10 from a number. Unfortunately, he added 10 instead of subtracting. Find the percentage change in the result.MediumSolve →Q6In a mixture of 100 litres of milk and water, 25% of the mixture is milk. How much water should be added to the mixture so that milk becomes 20% of the mixture?MediumSolve →Q7The height of a triangle is increased by 30%. What can be the maximum percentage increase in length of the base so that the increase in area is restricted to a maximum of 90%?MediumSolve →Q8The price of salt is reduced by 50% but, in spite of the decrease, Aayush ends up increasing his expenditure on salt by 50%. What is the percentage change in his monthly consumption of salt?MediumSolve →Q9At an election, the candidate who got 60% of the votes cast won by 200 votes. Find the total number of voters on the voting list if 66.67% people cast their vote and there were no invalid votes.MediumSolve →Q10The population of Gotham is 50,000 at this moment. It increased by 20% in the first year. However, in the second year, due to immigration, the population dropped by 10%. Find the population at the end of the third year if in the third year the population increases by 30%.?MediumSolve →

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