Question

A cake is made by mohana and veena individually in 10 days and 15 days what is number of days if both of them made the cake together

Answer 1

in question you need to find the work done by mohana in one day

Answer 2

1 day work of Mohana will be 1/10 and of Veena will be 1/15
They both work together, so their 1 day work will be 1/10+1/15=5/30 (now reverse this and write 30/5,and solve)
30/5=6
So they together can make in 6 days.
Hope it helps.
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