Reasoning: S = (150 + 320)/40 = 470/40 * 18/5 = 42
Ans: (B)
Question: A train 150 meters long completely crosses a 320 meters long bridge in 40 seconds. What is the speed of the train is?
Options:
(A) 32
(B) 42
(C) 54
(D) 66
(E) 09
Rationale: Simple interest = (18000 * 3 * 15)/100 = Rs. 8100
Amount = P + I = 18000 + 8100 = Rs. 26100
The answer: (D)
Question: What amount does Kiran get if he invests Rs. 18000 at 15% p.a. simple interest for three years?
Options:
(A) 29893
(B) 27773
(C) 29989
(D) 26100
(E) 29883
Reasoning: The total of 21 numbers = 21X25 = 525
The total of first 10 and last 10 numbers is = 10 X 14+10 X 19 = 330
So, the middle number is (525 - 330 ) = 195
Ans: (A)
Question: The average of 21 numbers is 25. The average of first ten numbers is 18 and the average of last ten numbers is 32. What is the middle number?
Options:
(A) 195
(B) 175
(C) 184
(D) 201
(E) 188
Rationale: The total of seven numbers = 7X18 = 126
The total of first 3 and last 3 numbers is = 3 X 14+3 X 19 = 99
So, the middle number is (126 - 99 ) = 27
The answer: (A)
Question: The average of seven numbers is 18. The average of first three numbers is 14 and the average of last three numbers is 19. What is the middle number?
Options:
(A) 27
(B) 30
(C) 31
(D) 33
(E) 34
Reasoning: Sum of 10 odd no. = 100
Average = 100/10 = 10
Ans: (B)
Question: The average of first 10 odd numbers is?
Options:
(A) 11
(B) 10
(C) 19
(D) 16
(E) 13
Reasoning: 61 is divisible by 1, and itself. So, it is a prime number.
Ans: (B)
Question: Which one of the following is a prime number?
Options:
(A) 10
(B) 61
(C) 49
(D) 75
(E) 91