Quantitative Apitude-Arithmetic Questions and Answers
Practice ModeShowing 10 of 25 questions
Q11
A can do a job in 10 days and B can do the same job in 15 days. How many days will they take together?
Answer: Option A
Explanation: Rate A = 1/10, B = 1/15. Combined = 1/10+1/15 = 1/6 ⇒ Time = 6 days.
Q12
A quantity increases from 80 to 100. What is the percent increase?
Answer: Option B
Explanation: Increase = 20. Percent = (20/80)×100 = 25%.
Q13
If 3/5 of a number is 24, what is the number?
Answer: Option C
Explanation: (3/5)x = 24 ⇒ x = 24 × 5/3 = 40.
Q14
What is the unit digit of 7^4?
Answer: Option A
Explanation: 7^2 = 49 (unit 9), 7^4 = (7^2)^2 has unit digit 9^2 = 81 ⇒ unit digit 1.
Q15
Find the sum of the first 10 natural numbers.
Answer: Option C
Explanation: Sum = n(n+1)/2 = 10×11/2 = 55.
Q16
What is 20% of 250?
Answer: Option C
Explanation: 20% of 250 = 0.20×250 = 50.
Q17
Four numbers have an average of 10. Three of them are 8, 12 and 15. What is the fourth number?
Answer: Option B
Explanation: Total = 4×10 = 40. Sum of three = 35. Fourth = 40 − 35 = 5.
Q18
Calculate 3/4 of (2/3 of 120).
Answer: Option B
Explanation: 2/3 of 120 = 80. 3/4 of 80 = 60.
Q19
Solve for x: x/5 + x/4 = 9.
Answer: Option C
Explanation: LCM 20 ⇒ (4x + 5x)/20 = 9 ⇒ 9x = 180 ⇒ x = 20.
Q20
What percent of 450 is 90?
Answer: Option C
Explanation: (90/450)×100 = 20%.