A) 18
B) 21
C) 19
D) 20
Correct Answer: D
Solution :
(d): \[3\left( a-1 \right)+4a+2\left( a+1 \right)=188\] \[\Rightarrow 9a-3+2=188\] \[\Rightarrow 9a=189\] \[\Rightarrow a=21\] \[a-1=20\] (ans).You need to login to perform this action.
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