Missing Number (SSC CPO 2020 Tier -1)

Total Questions: 24

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

Correct Answer: (b) 25
Solution:The pattern followed here is :

In each column

{(a + 1) × (b + 1)} = c

{(17 + 1) × (21 + 1)} ⇒ 18 × 22 = 396

{(18 + 1) × (22 + 1)} ⇒ 19 × 23 = 437

{(19+1) × (x + 1)} = 520

⇒ {20 × (x + 1)} = 520

⇒ x + 1 = 520 ÷ 20

⇒ x + 1 = 26

⇒ x = 25

Hence, "25" is the correct answer.

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

Correct Answer: (d) 25
Solution:The pattern followed here is :

{(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

Hence, "25" is the correct answer.

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

Correct Answer: (d) 180
Solution:The pattern followed here is :

Row wise: {(a × b) ÷ 2} = c

{(14 × 4) ÷ 2} ⇒ 56 ÷ 2 = 28

{(21 × 6) ÷ 2} ⇒ 126 ÷ 2 = 63

Similarly,

{(45 × 8) ÷ 2} ⇒ 360 ÷ 2 = 180

Hence, "180" is the correct answer.

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

Correct Answer: (c) 19
Solution:The pattern followed here is :

{(19 + 9) × 5} ⇒ 28 × 5 = 140

{(17 + 9) × 5} ⇒ 26 × 5 = 130

Similarly,

{(x + 5) × 5} = 120

⇒ x + 5 = 120 ÷ 5

⇒ x + 5 = 24

⇒ x = 19

Hence, "19" is the correct answer.

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

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)]

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)]

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)]

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)]

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)]

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