An animal shelter bought a van for Rs 6.15 lakhs. The shelter has already paid Rs 1,50,000. How much more does the shelter have to pay?

they would have to work 32 hours.

the given 6 = w/p is equivalent to 6p = w, where w is the total area of the walls and p is the area covered by a single can of paint.

knowing that 6 cans of paint will be needed, 6p = w becomes 6(6) = w = 36.   this tells us that the total area to be painted is 36 square units.