Reasoning: Sum of 18 even numbers = 18 * 19 = 342
Average = 342/18 = 19
Ans: (A)
Question: The average of first 18 even numbers is?
Options:
(A) 19
(B) 18
(C) 16
(D) 11
(E) 17
Rationale: Using the elimination method the option that fits this description is 25
5-2 = 3 (unit's digit that exceeds its ten's digit by 3)
25*7 = 175 (the product of the given number and the sum of its digits is equal to 175)
The answer: (A)
Question: Which of the options is a two-digit number, which has a unit's digit that exceeds its ten's digit by 3 and the product of the given number and the sum of its digits is equal to 175.
Options:
(A) 25
(B) 36
(C) 47
(D) 52
(E) 63
Reasoning: Speed downstream = 60 + 30 = 90 kmph
Speed upstream = 60 - 30 = 30 kmph
Ans: (E)
Question: The speed of a boat in still water is 60kmph and the speed of the current is 30kmph. Find the speed downstream and upstream?
Options:
(A) 40, 68 kmph
(B) 40, 30 kmph
(C) 90, 60 kmph
(D) 40, 60 kmph
(E) 90, 30 kmph
Rationale: D = 540 + 180 = 720
S = 54 * 5/18 = 15 mps
T = 720/15 = 48 se
The answer: (C)
Question: A train 540 meters long is running with a speed of 54 kmph. The time taken by it to cross a tunnel 180 meters long is?
Options:
(A) 287 sec
(B) 288 sec
(C) 48 sec
(D) 16 sec
(E) 17 sec
Reasoning: 44 + 28 + 10 = 82%
100 82 = 18%
850 * 18/100 = 153
Ans: (A)
Question: In a school of 850 boys, 44% of Muslims, 28% Hindus, 10% Sikhs and the remaining of other communities. How many belonged to the other communities?
Options:
(A) 120
(B) 125
(C) 153
(D) 200
(E) 250
Reasoning: Volume of prism = Area of base * height = 1/2* (square root of 5) * (square root of 5)*10 = 25
Ans: (E)
Question: Right triangle PQR is the base of the prism in the figure above. If PQ=PR=5 and the height of the prism is 10, what is the volume of the prism?
Options:
(A) 5
(B) 10
(C) 15
(D) 20
(E) 25