A) 18
B) 20
C) 30
D) 15
Correct Answer: D
Solution :
\[\frac{\begin{align} & 7x-5y=20 \\ & 12x+5y=75 \\ \end{align}}{19x\,\,\,\,\,\,\,\,\,\,\,\,=92}\] \[\therefore \] \[x=\frac{95}{19}=5\] Now, \[7x-5y=20\] \[\Rightarrow \] \[7\times 5-5y=20\] \[\Rightarrow \] \[5y=35-20=15\] \[\therefore \] \[y=\frac{15}{5}=3\] \[x\,y=5\times 3=15\]You need to login to perform this action.
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