Infosys Puzzle Solving Questions
Q1) Given is the set of nine numbers that relate to each other in a certain way.
Determine the missing number.
A. 4
B. 7
C. 3
D. 90
Answer : Option A
Explanation:
1* 5 = 5
2*5 = 10
3*5 = 15
Hence 4* 5 = 20
Therefore, ? = 4
Q2) Find the missing terms in the third figure. Assume the third figure works in the same way as the other two.
A. A=9,B=17
B. A=14,B=22
C. A=14,B=28
D. A=18,B=9
Answer : Option C
Explanation:
14 +8 = 22
22/2 = 11
Similarly
12+8 = 20
20/2 = 10
Hence,
20 + 8 = 28 (B)
28/2 = 14 (A)
A = 14 and B = 28
Q3) Find the missing term in the third figure. Assume the third figure works in the same way as the other two.
A. 50
B. 110
C. 61
D. 26
Answer : Option D
Explanation:
Figure 1 -- 2, 4 & 20
which is 2×2+4×4=20
Figure 2 -- 3,9 & 90
which is 3×3+9×9=90
therefore, 1,5=1×1+5×5=26
Q4) Which number should replace the question mark in the series: 14, 17, 22, 29, ?
A. 40
B. 39
C. 41
D. 43
Answer : Option A
Explanation:
14 +3 = 17
17 + 5 =22
22+7 = 29
Therefore, the next number will be 29+11 = 40
Q5) If sum of digits of a number 3Q6 is 9 then Q is ____.
A. Three
B. Two
C. One
D. Zero
Answer : Option D
Explanation:
If sum of digits of a number 3Q6 is 9 then Q is 0
3 + Q + 6 = 9
Q = 0
Q6) If X + X + X =33; X + Y + Y = 31 then X + Y = ?
A. 21
B. 18
C. 16
D. 12
Answer : Option A
Explanation:
If X + X + X =33
3X=33
X = 11
Sub X=11
X + Y + Y = 31
2Y +11 = 31
2Y = 20
Y = 10
then X + Y = 11+10 = 21
Q7) The missing number in the sequence : 25, 36, 49, ?, 81 is ___.
A. 64
B. 60
C. 72
D. 68
Answer : Option A
Explanation:
The missing number in the sequence 25, 36, 49,?, 81 is 64
25 = 52
36 = 62
49 = 72
64 = 82
81 = 92