Missing Number (SSC CPO 2020 Tier -1)

11. Find the missing number? [SSC CPO 24/11/2020 (Morning)]

(a) 30
(b) 25
(c) 27
(d) 28

Correct Answer: (b) 25

Solution:Logic: In each column

a, b, (a+1)(b+1)

(17+1) × (21+1) = 396

(18+1) × (22+1) = 437

(19+1) × (x+1) = 520

So, x is 25.

12. Find the missing number? [SSC CPO 24/11/2020 (Evening)]

(a) 13
(b) 33
(c) 21
(d) 25

Correct Answer: (d) 25

Solution: Logic: (a × 3) - (b/2) = c

First row: (14 × 3) - (64/2) = 42 - 32 = 10

Second row: (7 × 3) - (18/2) = 27 - 9 = 12

Third row: (23 × 3) - (89/2) = 69 - 44 = 25

13. Find the missing number? [SSC CPO 24/11/2020 (Evening)]

(a) 150
(b) 210
(c) 195
(d) 180

Correct Answer: (d) 180

Solution:Logic row wise: (a × b) / 2 = c

(14 × 4) / 2 = 28, (21 × 6) / 2 = 63

Similarly, (45 × 8) / 2 = 180

14. Find the missing number? [SSC CPO 24/11/2020 (Evening)]

(a) 24
(b) 28
(c) 19
(d) 47

Correct Answer: (c) 19

Solution:Here logic follows as:

(19 + 9) = 28, 28 × 5 = 140

(17 + 9) = 26, 26 × 5 = 130

Similarly, (x + 5) × 5 = 120 /5 x = 24 - 5 = 19

15. Find the missing number? [SSC CPO 24/11/2020 (Evening)]

(a) 88
(b) 72
(c) 68
(d) 120

Correct Answer: (c) 68

Solution:Logic is: In each row a², a + b, b

So, in the third row 49, x, 61

7 + 61 = x ⇒ x = 68

16. Find the missing number? [SSC CPO 24/11/2020 (Evening)]

(a) 596
(b) 544
(c) 558
(d) 552

Correct Answer: (c) 558

Solution:Logic is: In each column a, b, average of a and b.

So, 504 + 612 / 2 = 1116 / 2 = 558

17. Find the missing number? [SSC CPO 25/11/2020 (Morning)]

(a) 32
(b) 38
(c) 36
(d) 42

Correct Answer: (d) 42

Solution:Logic is: Row I and III are related in the same way as the row II and IV. As 12 × 1.5 = 18.

In the same way, 16 × 1.5 = 24

In column II, 22 × 0.5 = 11

In the same way, 42 × 0.5 = 21

18. Find the missing number? [SSC CPO 25/11/2020 (Morning)]

(a) 16
(b) 61
(c) 51
(d) 15

Correct Answer: (b) 61

Solution:The difference between the first row and the second row is a multiple of 3 and the difference between the second row and the third row is the multiple of 4. For example 33 - 12 = 21 (a multiple of 3, As 3 × 7 = 21)

40 - 12 = 28 (a multiple of 4, As 4 × 7 = 28) Similarly, 61 - 28 = 33 (a multiple of 3, As 11 × 3 = 33)

61 - 17 = 44 (a multiple of 4, As 11 × 4 = 44). So, 61 is the correct answer

19. Find the missing number? [SSC CPO 25/11/2020 (Morning)]

(a) 10
(b) 14
(c) 12
(d) 8

Correct Answer: (d) 8

Solution:Logic: In each column, first number × third number = (second number)² 8 × 18 = 12²; 32 × ? = 16² = ? = 8

20. Find the missing number? [SSC CPO 25/11/2020 (Morning)]

(a) 20
(b) 18
(c) 22
(d) 16

Correct Answer: (b) 18

Solution:Logic: In each row, the sum of first and second number is equal to the third and fourth number. So, 32 + 16 = ? + 30 ⇒ ? = 18