Question

Q.1) A and B can independently finish a piece of
work in 36 days and 45 days respectively. They
started working together and after few days A
left. After that B could finish the remaining work
n 36 days. After how many days of working did A
leave? (SBI CLERK prelims 2015)
(a) 5 days
(b) 6 day's
(c) 4 days
(d) 8 days
(e) 12 days​

Answer 1

Answer:

option c 4 days

Step-by-step explanation:

The part of the work completed by B- alone after A had left= 36/45= 4/5.

So(1–4/5)= 1/5 part of the work was completed by both A and B, before A- left.

In 1- day A and B could complete = 1/36+1/45= (5+4)/180= 9/180 =1/20 part of the work.

Therefore 1/5 part of the work could have been completed by both A and B in = (1/5)÷ 1/20= 20/5= 4 days.

So after 4 days A left.

please mark me as the brainliest

please mark me as the brainliest

please mark me as the brainliest