A) 86
B) 64
C) 75
D) 42
Correct Answer: D
Solution :
(d): \[10a+b=7\left( a+b \right)\] \[\Rightarrow 3a=6b\Rightarrow a=2b\] \[10b+a\,\,\text{or}\,\,10b+2b=\left( 10a+b \right)-18\] Or \[12b=\left( 20b+b \right)-18\] Or \[18=9b\Rightarrow b=2;a=4\] \[\Rightarrow 7\left( a+b \right)=42.\]You need to login to perform this action.
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