Question 101
A person A having completed 60% of the work in 15 days, calls another person B and they together finish the remaining work in 5 days. Then how many days B alone would have taken to do the whole work?
Solution
If A completes 60% of work in 15 days alone, then he can do entire work alone in 25 days.
Now, it is given that A and B complete 40% of work together in 5 days.
Hence, A and B together can do entire work in 100/8 i.e. 12.5 days
Now, let B be able to do entire work alone in x days
Hence, going by the standard formula:
$$\frac{100}{8}=\frac{25x}{25+x}$$ ==> x = 25 days
Get AI Help
Create a FREE account and get:
- Download Maths Shortcuts PDF
- Get 300+ previous papers with solutions PDF
- 500+ Online Tests for Free
