Question

A alone can do a piece work in 12days and B can do the same work in 15 days. what part of the work will they do in 3days.

Answer 1

Answer:

9/20  ( 0.45) work will be completed in 3 days by A & B together

Step-by-step explanation:

A alone do a piece of work in 12 days

A's 1 day work = 1/12

B Alone do a piece of work in 15 days

B's 1 day work = 1/15

A + B 's one day work

= 1/12 + 1/15

=(1/60) ( 5 + 4)

= 9/60

= 3/20

A+ B's 3 days work will be

= 3 × (3/20)

= 9/20

= 0.45

Answer 2

A can do Work in=12 days
A 1 day work=1/12

B can do Work in=15 days
B 1 day Work=1/15

If They Work Together
=1/15+1/12
=4+5/60
=9/60
=3/20

(A+B) 1 day work=3/20
(A+B) 3 day Work=3×3/20
=9/20

$\boxed{\mathbf{Work\:in\:3\:days=\frac{9}{20}}}$