CLAT Sample Paper CLAT Sample Paper-8

  • question_answer
    The combined cost of 5 doors and 7 bells was Rs 2350 while the cost of 10 doors and 4 bells is Rs 2200. How much is the cost of 2 doors?

    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 \[D=\frac{2350-7\times 250}{5}=\text{Rs}\,120\] \[\therefore \]      \[2\,D=\,\text{Rs}\,\,240\]

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