Question

A and B can complete a work in 15 days and 10 days respectively they started doing the work together but after 2 days we had to leave and a alone completed the remaining work then the whole work was completed in​

Answer 1

Answer:

12 days

Step-by-step explanation:

A,

in 15 days do a work

therefore in 1 day he does=1/15

B,

in 10 days do a work

therefore in 1 day he does=1/10

(A+B),

in 1 day do (1/15+1/10)=2+3/30=5/30=1/6

in 2 days do=2×1/6=1/3

rest work,

1-1/3=2/3

A,

1/15 does in 1 day

therefore 2/3 does=15×2/3=10days

whole work=10+2=12days