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प्रश्न
Choose the most appropriate option.
A can do a piece of work in 8 days and B alone can do the same work in 10 days. A and B agreed to do the work together for Rs. 720. With the help of C, they finished the work in 4 days. How much C is to be paid?
विकल्प
Rs. 80
Rs. 70
Rs. 82
Rs. 72
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उत्तर
Rs. 72
Explanation:
C's 1-day work`=1/4-(1/8+1/10)`
`=1/4-9/40⇒1/40.`
A's wages: B's wages: C's wages`=1/8: 1/10 : 1/40=5:4:1`
∴ C's share (for 4 days)`=720/10xx1=72`
= Rs. 72
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