Discussion
Find the missing number, if same rule is followed in all the three figures.
Answer: B
The missing number is 23.
In each figure, the number inside is the top number divided by the bottom one, plus the left number divided by the right one:
\[ \begin{aligned} 81 \div 9 + 28 \div 7 &= 9 + 4 = 13 \\ 56 \div 8 + 63 \div 3 &= 7 + 21 = 28 \\ 48 \div 4 + 55 \div 5 &= 12 + 11 = 23 \end{aligned} \]
The rule fits both complete figures, so the third gives 23. 21, 25 and 27 do not come from this rule.
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