Discussion
The value of x in the following figures is :
| Circle | Upper left | Upper right | Lower |
|---|---|---|---|
| 1 | 89 | 16 | x |
| 2 | 38 | 18 | 8 |
| 3 | 25 | 17 | 6 |
Answer: A
The value of x is 15.
In each circle, the sum of the two upper numbers divided by 7 gives the lower number:
\[ \begin{aligned} (38 + 18) \div 7 &= 8 \\ (25 + 17) \div 7 &= 6 \\ (89 + 16) \div 7 &= 15 \end{aligned} \]
The rule works for both complete circles, so it fixes \(x = 105 \div 7 = 15\). 16, 17 and 18 do not fit it, since 112, 119 and 126 would be needed as sums.
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