Mathematical Aptitude MCQ - Ratio Proportion, Percentage and Discounting

26 The price of cooking oil has increased by 25%. The percentage of reduction that a family should effect in the use of cooking oil so as not to increase the expenditure on this account is

Let original price = 100
Original quantity = 100
Total expenditure = 100 × 100
New price = 100 + 25 = 125
New quantity = Q
As expenditure is to be kept same, 100 × 100 = 125 × Q
Q = (100 × 100)/125 = 80. % reduction in quantity = 100 - 80 = 20

27 In an organization, 40% of the employees are matriculates, 50% of the remaining employees are graduates, and the remaining 180 are postgraduates. How many employees are graduates?

Let total employees = 100
Matriculates = 40
Remaining = 100 − 40 = 60
Graduates = 50% of remaining 60 = 30
Postgraduates = 100 − 40 − 30 = 30
Graduates = Postgraduates
Hence, graduates are also 180

28 In a town, 96% of the population is 23,040. The total population of the town is

96% of total population = 23,040
Hence, total population = 23,040 × 100/96 = 24,000

29 If 75% of the students in a school are boys and the number of girls is 420, then the number of boys is

Ratio between boys: girls = 75%: 25% = 3 : 1
Hence, number of boys = 3 × 420 = 1,260

30 A man spends Rs 3500 and saves 12 1/2 % of his income. His monthly income (in Rs ) is

(100 – 12.5)%, i.e., 87.5% of total income = 3500,
total income = 3,500 × 100/87.5 = 4000

Mathematical Aptitude MCQ - Ratio Proportion, Percentage and Discounting

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Mathematical Aptitude MCQ - Ratio Proportion, Percentage and Discounting

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