Rationale: 36^2 = 6*6*6*6 = 2^4*3^4
Total factors = (4+1)*(4+1) = 5*4 = 20
The answer: (C)
Question: How many factors does 34^2 have?
Options:
(A) 2
(B) 8
(C) 20
(D) 25
(E) 26
Reasoning: 1/20 - 1/28 = 1/70
70 minutes
Ans: (C)
Question: A pipe can fill a cistern in 20 minutes whereas the cistern when fill can be emptied by a leak in 28 minutes. When both pipes are opened, find when the cistern will be full?
Options:
(A) 17 minutes
(B) 87 minutes
(C) 70 minutes
(D) 27 minutes
(E) 11 minutes
Rationale: Answer = A = 5
If least = -3, then largest = 6
Range = 6- 1 = 5
The answer: (A)
Question: List K consists of 10 consecutive integers. If -3 is the least integer in list K, what is the range of the positive integers in list K?
Options:
(A) 5
(B) 6
(C) 7
(D) 11
(E) 12
Reasoning: Sum of 15 natural no. = 240/2 = 120
Average = 120/15 = 8
Ans: (B)
Question: The average of first 15 natural numbers is?
Options:
(A) 7
(B) 8
(C) 9
(D) 10
(E) 11
Rationale: (60/100) * 50 (50/100) * 30
30 - 15 = 15
The answer: (E)
Question: How much 60% of 50 is greater than 50% of 30?
Options:
(A) 18
(B) 91
(C) 11
(D) 17
(E) 15
Rationale: S = (120 + 60)/2 = 90 kmph
The answer: (C)
Question: The speed of a car is 120 km in the first hour and 60 km in the second hour. What is the average speed of the car?
Options:
(A) 89 kmph
(B) 92 kmph
(C) 90 kmph
(D) 65 kmph
(E) 77 kmph