Question: A train 100 meters long completely crosses a 300 meters long bridge in 45 seconds. What is the speed of the train is?
Options:
(A) 32
(B) 545
(C) 88
(D) 66
(E) 09
Answer: S = (100 + 300)/45 = 400/45 * 18/5 = 32
The answer is (A).

Question: Three 6 faced dice are thrown together. The probability that exactly two dice show the same number on them is ?
Options:
(A) 5/16
(B) 5/12
(C) 5/87
(D) 5/56
(E) 5/38
Answer: Using question number 11 and 12, we get the probability as
1 - (1/36 + 5/9) = 5/12
The answer is (B).

Question: The average of first 16 even numbers is?
Options:
(A) 19
(B) 18
(C) 16
(D) 11
(E) 17
Answer: Sum of 16 even numbers = 16 * 17 = 272
Average = 272/16 = 17
The answer is (E).

Question: The average of seven numbers is 4. The average of first three numbers is 2 and the average of last three numbers is 6. What is the middle number?
Options:
(A) 3
(B) 4
(C) 6
(D) 7
(E) 8
Answer:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
The total of seven numbers = 7X4 = 28
The total of first 3 and last 3 numbers is = 3 X 2+3 X 6 = 24
So, the middle number is (28 - 24 ) = 4
The answer is (B).