Question

Mary and David can do a work individually in 10 days and 15 days respectively. At first
Mary alone worked for 4 days, then David alone worked for 5 days and left. Maria came
and completed the remaining work in 4 days. If Mary, David and Maria would work
together, let's calculate in how many days they would complete the work.​

Answer 1

Answer:

Mary and david can do a work individually in 10 days and 15 day respectively. At first Mary alone worked for 4 day then David alone worked for 5 days and left .

Maria came and completed the remaining work in 4 days .

if mary David and Maria would work together.

Then according to the question :-

10+15+5+4+4= 28.

Hence in 28 days they would complete the work .