**Question:**

R & K can finish a work in 40 & 45 days respectively, after working together for few days, K left & R finished rest of the work in 23 days. After how many days K left. Guys answer with explanation?

Yes i m right as by mistake i write 15 days instead of 9 days in my explaination......

Heart..... 9 is correct

Vicky.... your explanation pls

Sorry by mistake i write 15 instead of 9

Yup its 9 days

Answer is k left after 15 days

Explaination-first calculate their individual capability of work

R-9work/day

K-8work/day

Then calcuate total work done by R alone in 23 days which is 9*23=207

Total work done=360(LCM OF 40&45)

Find out the remaining work that has to done by R & k which is 157

Now just divide 157 by 17(sum of R &K ability) to get the answer

9 days?