Question

P and Q can do a piece of work in 10 days , A and R can do it in 15 days , R and P can do same work in 20 days​

Answer 1

Answer:

Hey!!!

Step-by-step explanation:

Let work done by P in 1 day = p,

Work done by Q in 1 day = q,

Work done by R in 1 day = r

p + q = 1/12 --------eq1

q + r = 1/15 --------eq2

r + p = 1/20 --------eq3

Adding all the above, 2p + 2q + 2r = 1/12 + 1/15+ 1/20 = 12/60 = 1/5

p+q+r=1/10--------eq4

From eq 4 & eq1 --eq4-eq1

r=1/10−1/12=6−5/60=1/60

Number of days R needs to work to complete the work =60