1. Which number should replace the question mark?
8 5 21
35 32 12
32 28 31
4 ? 28
A. 3
B. -2
C. -6
D. 48
Correct answer: C
(For each row subtract the second column from the first column. The result is equal to the sum of the digits in the last column.)
2. Which number should replace the question mark?
17 8 5 5
13 7 5 4
6 12 6 3
10 6 4 ?
A. 4
B. 5
C. 6
D. 7
Correct answer: A
(For each row the sum of the first two columns is equal to the multiple of the last two columns)
3. Which number should come next in this series?
3,5,8,13,21,
A. 4
B. 21
C. 31
D. 34
Correct answer: D
Explanation: 3+5=8, 5+8=13 and so on.
4. Which number should come next in this series?
25,24,22,19,15
A. 4
B. 5
C. 10
D. 14
Correct answer: C
Explanation: The pattern decreases progressively: -1, -2, -3, -4, -5
