P, Q, R, S can do a work individually in 10, 20, 30, 40 days respectively.P and Q do half the work and the remaining half is done by R and S together. In how many days was the work finished ?
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Answer:
20 days
Step-by-step explanation:
p 10
q 20
p+q=10+20=30
half work finished
30/2=15.
r 30
s 40
r+s=30+40=70
70/2=35
r+s-p+q=35-15=20
work is done in 20 days.
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