A and B do a work together in 6 days. If A works alone, it takes 10 days. Then how many days B takes to complete that work?

Solve This... A and B do a work together in 6 days. If A works alone then it takes 10 days, then how many days B takes to complete that...

We have total 100 rs and we need to buy exactly 100 pens. The prizelist for pens is as follow: 1) Blue pen = 0.5 rs 2) Black pen =...