Rationale: This is a simple alternating subtraction and addition series; The first series begins with 3 and adds 5; the second begins with 9 and subtracts 2, and so on.
The answer: (E)
Question: Fill in the blank with the correct number in this number series: 3, 9, 8, 7, __, 5, 18, ?
Options:
(A) 6
(B) 7
(C) 9
(D) 10
(E) 13
Reasoning: (80/100) * 40 (4/5) * 25
32 - 20 = 12
Ans: (D)
Question: How much is 80% of 40 is greater than 4/5 of 25?
Options:
(A) 17
(B) 19
(C) 11
(D) 12
(E) 10
Rationale: If the number is divisible by 3, the sum of the digits must also be divisible by 3. Only 4 yields such a number.
The answer: (E)
Question: The number N is 5,2H7, where H represents the ten's digit. If N is divisible by 3, what is the value of H?
Options:
(A) 3
(B) 8
(C) 5
(D) 6
(E) 4
Reasoning: Clearly, 31 is a prime number. So choice E is correct.
Ans: (E)
Question: Which oif the following is a prime number?
Options:
(A) 45
(B) 39
(C) 27
(D) 33
(E) 31
Rationale: Number of times wheel moves in 1 hour = 20 * 30 = 1200
:. Distance moves = (1200*30) cms = 36000 cms
In metres = 360 metre
The answer: (A)
Question: A wheel rotates 20 times every minute and moves 30 cm during each rotation. How many metres does the wheel move in one hour?
Options:
(A) 360 metre
(B) 12 metre
(C) 320 metre
(D) 1200 metre
(E) 260 metre
Rationale: 720 * 5/18 = 200 mps
The answer: (B)
Question: Express a speed of 720 kmph in meters per second?
Options:
(A) 120 mps
(B) 200 mps
(C) 181 mps
(D) 190 mps
(E) 125 mps