Rohan and Sohan can do a piece of work together in 30 days. Sohan and Mohan can do same piece of work together in 24 days.
Rohan and Mohan can do same piece of work together in 40 days.
Who will take least days to complete same work if done alone?

Set up a system of equations

One shot. if 60% of 10 is 6, then what is 70%? we know it would be seven (since 60% is mathematically 60/100, or 6/10, then 70% is 70/100, or 7/10) but we can check anyway using ratios: 6 : 60% = x : 70%*inverse multiplicationx * 60% = 6 * 70%*divide both sides by 60%x = (6 * 70%) / 60%x = 7and since he has made 6 shots already, he would need just one more to get 7 shots or 70%. if the explanation is too confusing, comment and i will try to