Ques: The average of first 16 even numbers is?
Options:
(A) 10
(B) 11
(C) 17
(D) 13
(E) 14
Ans: (C)
CoT: Sum of 16 even numbers = 16 * 17 = 272
Average = 272/16 = 17

Ques: A women purchased 3 towels @ Rs.100 each, 5 towels @ Rs.150 each and two towels at a certain rate which is now slipped off from his memory. But she remembers that the average price of the towels was Rs.155. Find the unknown rate of two towels?
Options:
(A) A) 400
(B) B) 450
(C) C) 500
(D) D) 550
(E) E) 600
Ans: (C)
CoT: 10 * 155 = 1550
3 * 100 + 5 * 150 = 1050
1550 1050 = 500

Ques: A 70 cm long wire is to be cut into two pieces so that one piece will be 2/5th of the other, how many centimeters will the shorter piece be?
Options:
(A) 20
(B) 40
(C) 45
(D) 25
(E) 60
Ans: (A)
CoT: 1: 2/5 = 5: 2
2/7 * 70 = 20

Ques: A batsman makes a score of 87 runs in the 17th inning and thus increases his average by 3. Find his average after 17th inning?
Options:
(A) 39
(B) 88
(C) 3
(D) 7
(E) 62
Ans: (A)
CoT: Let the average after 7th inning = x
Then average after 16th inning = x - 3
\inline
n_jvn herefore 16(x-3)+87 = 17x
\inline
n_jvn herefore x = 87 - 48 = 39