Question:
Working 8 hours a day, Ashu can copy a book in 18 days. How many hours a day should he work so as to finish the work in 12 days?
Solution:
If Ashu works for 8 hours daily, he can finish the work in 18 days.
If he works for 1 hour daily, he can finish the work in $(18 \times 8)$ days or 144 days.
$\therefore$ Number of hours he should work daily to finish the work in 12 days $=\frac{144}{12}=12$
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