Question

Priya and meena alone can complete a work in 15 days and 20 days respectively, if they do that work together for 4 days then what is the amount of work left if the total work is for 225 units

Answer 1

Total work is 225 units
Priya works for 15 days. So, she does 15 units of works everyday which completes 225 units of work in 15 days
i.e 225 units/15 days=15 units/day
Meena works for 20 days. So, she does 11¼ units of works everyday which completes 225 units of work in 20 days
i.e 225 units/20 days=11.25 units/day
Meena and Priya together do 26.25 units of work in a day. If they work for 4 days together, they would complete 105 units of work.
i.e 26.25 units*4=105 units
Total work is 225 units
After subtracting 105 units from total work, 120 units of work will be remaining.
The answer is 120 units.
Hope it helps.