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P can do a work in 20 days, Q can do the same in 12 days and R 16 days. Q and R start the work and leave after 6 days...

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P can do a work in 20 days. Q can do the same work in 12 days and R can do the same in 16 days. Q and R start the work and leave after 6 days. P finishes the remaining work in X days. What is the value of X?

posted Jun 16, 2018 by anonymous

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1 Answer

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2.5 days

If W is work then
W=20P=12Q=16R

Daily speed is:
P=W/20
Q=W/12
R=W/16

W=6*(W/12+W/16)+X*W/20
X=2.5

answer Jun 16, 2018 by Hanifa Mammadov



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