i need the excluded values

An unknown number of kids and buses are getting assigned. when assigning 4 kids to each bus, there are 2 kids that aren't placed in a bus. when assigning 8 kids to each bus, there are 2 empty buses. how many total kids are there?

With both problems. a. s.a. p directions on photo ^

8litres of paint can cover 129.6 m². how much paint is required to paint an area of 243m²?