Test-Series - numerical

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Test Number 21/39

Q: Find: S.l. on Rs 6250 at 14% per annum for 146 days.
A. Rs.350
B. Rs.450
C. Rs.550
D. Rs.650
Solution:  P = Rs. 6250, R = 14 %  & T = (146/365) years = 2/5 years .  S.I=Rs.6250*14*25100=Rs.350
The correct answer is: A) Rs.350
Q: The length of the room is 5.5m and width is 3.75m. Find the cost of paving the floor by slabs at the rate of Rs.800 per sq meter
A. Rs.16500
B. Rs.15500
C. Rs.17500
D. Rs.18500
Solution: l=5.5m w=3.75marea of the floor = 5.5 x 3.75 = 20.625 sq mcost of paving = 800 x 20.625 = Rs. 16500
The correct answer is: A) Rs.16500
Q: The average weight of boys in a class is 30 kg and the average weight of girls in the same class is 20kg. If the average weight of the whole class is 23.25 kg, what could be the possible strength of boys and girls respectively in the same class?
A. 14 and 16
B. 13 and 27
C. 17 and 27
D. None of these
Solution: Total no.of boys : no. of girls = 13:27        27             :                13
The correct answer is: B) 13 and 27
Q: A train travelling at a speed of 75 mph enters a tunnel 312miles long. The train is 14mile long. How long does it take for the train to pass through the tunnel from the moment the front enters to the moment the rear emerges?
A. 2.5 min
B. 3 min
C. 3.2 min
D. 3.5 min
Solution: Total distance covered =72+14miles =154miles   Time taken = 154*75hrs = 120 hrs =120*60min = 3 min
The correct answer is: B) 3 min
Q: How many leap years do 300 years have?
A. 75
B. 74
C. 72
D. 73
Solution: Given year is divided by 4, and the quotient gives the number of leap years. Here, 300%4 = 75. But, as 100,200 and 300 are not leap years => 75 - 3= 72 leap years.
The correct answer is: C) 72
Q: The inner circumference of a circular race track, 14 m wide, is 440 m. Find radius of the outer circle
A. 44
B. 22
C. 33
D. 84
Solution: Let inner radius be r metres. Then, 2πr = 440 ; r = 440×744= 70 m. Radius of outer circle = (70 + 14) m = 84 m.
The correct answer is: D) 84
Q: In how many ways a committee, consisting of 5 men and 6 women can be formed from 8 men and 10 women?
A. 53400
B. 17610
C. 11760
D. 45000
Solution: Required number of ways = 8C5*10C6 =  8C3*10C4 = 11760
The correct answer is: C) 11760
Q: In an examination, a student scores 4 marks for every correct answer and loses 1 mark for every wrong answer. If he attempts all 60 questions and secures 130 marks, the no of questions he attempts correctly is :
A. 35
B. 38
C. 40
D. 42
Solution: Let the number of correct answers be X. Number of incorrect answers = (60 – X). 4x – (60 – x) = 130 => 5x = 190  => x = 38
The correct answer is: B) 38

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