A) Rs 100
B) Rs 240
C) Rs 80
D) Rs 120
Correct Answer: B
Solution :
\[5D+7B=2350\] ...(i) and \[10D+4B=2200\] ...(ii) On multiplying Eq. (i) by 2 and then subtracting Eq. (ii) from it, we get \[10D+14B=4700\] \[\Rightarrow \] \[-10D-4B=-2200\] \[\Rightarrow \] \[10\,B=2500\] \[\therefore \] \[B=250\] Now, from Eq. (i), we get \[D=\frac{2350-7\times 250}{5}=\text{Rs}\,120\] \[\therefore \] \[2\,D=\,\text{Rs}\,\,240\]You need to login to perform this action.
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