Question

Replace the ? with an appropriate number.

	8	10
16	22	31
21	?	9

• A. $20$
• B. $21$
• C. $22$
• D. $23$

Answer 1

The correct option is A $20$

First column: $(13+16+21=50)$

Third column: $(10+31+9=50)$

Similarly, in the second column, let the missing number be x.

Therefore, $(8+22+x=50)$

or, $(x=20)$

Hence, option (A) is the correct answer.