If two mixers and one T.V cost Rs. 7000. While two T.V s and one mixer cost Rs. 9800. The value of one T.V is:_________?
Correct answer: C. Rs. 4200
- A. Rs. 2800
- B. Rs. 2100
- C. Rs. 4200
- D. Rs. 8400
Explanation
Let one mixer cost m rupees and one TV cost t rupees. From 2m + t = Rs. 7,000 and m + 2t = Rs. 9,800, subtraction gives t - m = Rs. 2,800; solving gives t = Rs. 4,200. A common error is to subtract the equations but stop at the difference of Rs. 2,800, which is not the TV's full price.
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