A) 21
B) 12
C) 32
D) 22
Correct Answer: D
Solution :
\[\text{16}+\text{12}=\text{28}\div \text{2}=\text{14}\] \[\text{21}+\text{9}=\text{3}0\div \text{2}=\text{15}\] \[\left( \text{1}0+x \right)\div \text{2}=\text{16}\Rightarrow x=\text{32-1}0=\text{22}\]
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