Test of Reasoning - Number Which Replaces Question Mark

Directions: In the questions given below, four alternatives are given for each question. Click on the option which you think is the RIGHT ANSWER to the question.

Which number will come in the place of question mark (?)

1.

4 7 3 6

Explanation: In the first column 9 – 5 = 4 + 7 = 11, in the second column 6 – 8 = - 2 + 4 = 2. Similarly in the third column, 8 – 4 = 4 + 3 = 7. Thus 3 is the answer.

2.

9 6 15 14

Explanation: The sum of numbers in each row or column is 15.

3.

9 6 7 5

Explanation: The last number in each column is the product of the 3 numbers above it.

4.

4 2 3 1

Explanation: The last number in the first column is the sum of two products 30 (product of 5 and 6) and 35 (product of 5 and 7). Similarly (4 x 3) + (4 x 2) = 20.

5.

169 143 455 545

Explanation: The last number in each column is the product of the 3 numbers above it.

6.

14 17 13 16

Explanation: The last number is obtained thus (10 – 7) + 5 = 8 and (15 – 9) + 7 = 13. Therefore, (20 – x) + 9 = 16 which gives us x = 13.

7.

12 14 13 8

Explanation: In each row the last number is arrived thus (4 + 12) – 11 = 5, (6 + 7) – 10 = 3, (8 + 9) – 10 = 7. Therefore in the last row, (7 + 5) – x = 4 which gives us x = 8.

8.

10 12 13 20

Explanation: In each column, the last number is half the product of the numbers above it. 5 x 2 x 8 = 80/2 = 40, 5 x 4 x 3 = 60/2 = 30 and 2 x 1 x 10 = 20/2 = 10.

9.

12 10 21 25

Explanation: The numbers in each row follow the pattern - 8 – 1 = 7 + 3 = 10 + 2 = 12 and 13 – 1 = 12 + 3 = 15 + 2 = 17. Thus the number in the ? position is 12.

10.

2 4 5 3

Explanation: The last number is the product of the 3 numbers above it.