Enhance your arithmetic skills with the best 50 arithmetic questions from all prelims exams. Prepare effectively for your upcoming exams.
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Q1. If a person spends 30 % of his income on rent, 20 % on food, and 10 % on transportation, what percentage of his income is left
(A) 40%
(B) 50%
(C) 60%
(D) 30%
Answer: 40%
Explanation: Percentage left = 100 % 30 % + 20 % + 10 %) = 40%
Q2. P is thrice as good a workman as Q and together they finish a piece of work in 24 days. The number of days taken by P alone to finish the work is
(A) 34 days
(B) 32 days
(C) 24 days
(D) 18 days
Answer: 32 days
Explanation: P’s 1 days’ work) : (Q’s 1 days’ work) = 3 : 1 (P + Q)’s = 1 days work = 1/24. Divide 1/24 in the ratio 3 : 1. P’s 1 day’s work =[ 1/24 × 3/4 ]=1/32. Hence , P alone can finish the work in 32 days.
Q3. The ratio of the ages of A and B is 3:4 . If A is 18 years old, how old is B?
(A) 18 years
(B) 24 years
(C) 20 years
(D) 30 years
Answer: 24 years
Explanation: B’s age = 18 × 4/3 = 24 years
Q4. A sum of Rs. 8000 is invested at an interest rate of 5 % per annum for 2 years. Find the simple interest earned
(A) Rs. 700
(B) Rs. 600
(C) Rs. 900
(D) Rs. 800
Answer: Rs. 800
Explanation: Simple interest = ( 8000 × 5 × 2 ) / 100 = Rs. 800
Q5. A boat travels 30 km upstream in 3 hours and the same distance downstream in 2 hours. Find the speed of the boat in still water
(A) 13.5 km/h
(B) 12.5 km/h
(C) 12 km/h
(D) 11 km/h
Answer: 12.5 km/h
Explanation: Speed of boat = ( 30/3 + 30/2 ) / 2 =(10 + 15 ) / 2 = 12.5 km/h