Sita and Geeta can finish a work in 20 days Sita alone can do 1/5th of the work in 12 days in how many days Geeta can do it ?
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Answer:
A does 100% of the work in 15 days.
100%:15 days
100%/15:1 day
20%/3:1 day
B does 100% of the work in 20 days.
100%:20 days
5%:1 day
In 1 day working together at these rates, they complete (20%/3)+5%, which equals 35%/3.
To simplify, they complete 35% of the work in 3 days. 70% in 6 days. In 9 days, they’d complete 105% of the work, but this is overshooting. Let’s work our way down. In 8 days, they complete 8*(35%/3)=280%/3=93.333...%
Already this is too low. We need 100%. So the answer is 9 days, but they get to go home early on the last day.
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