A and B each working alone can do a work in 15 days and 25 days, respectively. They started the work together but B left after some time and A finished the remaining work in 7 days. After how many days from the start did B leave ?
Correct Answer: Description for Correct answer:
Let B left the work after x days from the start.
According to the question,
\( \Large \frac{x}{25}+\frac{x+7}{15} \)=1
=> \( \Large \frac{3x+5x+35}{75} \)=1
=> 8x+75-35 => x=\( \Large \frac{40}{8} \)
x=5
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