Discussion
Find the unknown number?
| 20 | 13 | 07 |
| 30 | 08 | 22 |
| 40 | ? | 28 |
Answer: B
The unknown number is 12.
In each row the first number minus the second gives the third:
\[ \begin{aligned} 20 - 13 &= 7 \\ 30 - 8 &= 22 \\ 40 - ? &= 28 \Rightarrow ? = 12 \end{aligned} \]
Equivalently the second and third numbers add up to the first (13 + 7 = 20, 8 + 22 = 30). 10, 16 and 20 do not satisfy the relation in the third row.
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