Three painters can paint three walls in three minutes how many painters are needed to paint 27 walls in 9 minutrs

A alone can paint a wall in 50 days B alone can do it in 10 days. If A, B and C together can paint the wall in 6.25 days, then in how many days can C alone paint the wall?

It takes 21 minutes for 5 people to paint 7 walls.How many minutes does it take 3 people to paint 5 walls?

How many planes can be made to pass through three distinct points?

How many lines can be drawn passing through three collinear points ?

Garima and her sister together can paint the walls of their house in 45 days. If Garima alone did the job, it would have taken her 81 days. If they both started painting together but Garima's sister had to leave 9 days before the completion of the work, how many days in all would it take the sisters to paint their house?