Question

184. P is able to do a piece of work in 15 days and Q can do the same work in 20 days. If they can
work together for 4 days, what is the fraction of work left?
a)8/15. b)7/15. c)11/15. d)2/11.Explain in detail pliz​

Answer 1

Answer:

p=15day= full work

1 day=1/15 part

q=20 days= full work

1 day =1/20 part

work together =1/15+1/20

LCM =60

1×4/15×4 + 1×3/20×3

4/60+3/60=7/60 (1 day work)

full work =60/7

p+q=60/7

p+q worked for 4 days so 4 day work

60/7×4

15/7

4 day work=7/15

work left=1-7/15

15/15-7/5{lcm }

8/15

that's all my answer

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