Question

A can do a work in 15clays and B in 20 days. If they
work on it together for 4 days, then the fraction of
the work that is left is :
(a) 1/4
(b) illo
(c) 8/15
(d) 7/15
please help me for this answer.
By ayushi​

Answer 1

Answer:

A's 1 day's work=1/15

B's 1 day's work=1/20

(A+B)'s 1 day's work=1/15+1/20=4+3/60=7/60

(A+B)'s 4 day's work=7/60×4=7/15

Remaining work=1-7/15=8/15

Answer 2

Answer:

7/15

please mark as best answer and thank me