Question: The average of first 13 even numbers is?
Options:
(A) 10
(B) 11
(C) 12
(D) 13
(E) 14
Answer: Sum of 13 even numbers = 13 * 14 = 110
Average = 182/13 = 14
The answer is (E).

Question: Scott's average (arithmetic mean) golf score on his first four rounds was 58.What score does he need on his fifth round to drop his average score by 2 points?
Options:
(A) 48
(B) 72
(C) 78
(D) 88
(E) 312
Answer: Average score for first 4 rounds = 58
Average score after 5 rounds = 56
Score Scott needs on his 5th round to drop average score by 2 points = 58 - (2*5) = 48
The answer is (A).

Question: If the average (arithmetic mean) of the four numbers K, 2K + 3, 3K 5 and 5K + 1 is 96, what is the value of K?
Options:
(A) 11
(B) 15 3/4
(C) 22
(D) 35
(E) 25 3/10
Answer: K + 2K +3 + 3K - 5 + 5K +1 = 11K -1
(11K -1)/4 = 96
11K = 96 * 4 +1 = 384 +1 = 385
K = 385 / 11 = 35.
The answer is (D).

Question: In a certain parking lot, 3% of the cars are towed for parking illegally. However 80% of the cars which are parked illegally are not towed. What % of cars in the parking lot are parked illegally.'
Options:
(A) 11
(B) 13
(C) 15
(D) 60
(E) 75
Answer:
So Total no. of cars parked illegally: 300
Total no. of cars: 2000
300/2000*100, So 15%
The answer is (C).