Spencer can do 3 oil changes in 1 hour. Preston can do 5 oil changes every hour. If they work together how long
would it take them to do 24 oil changes?

3 hours

Step-by-step explanation:

3x + 5x = 24

add 3x and 5x = 8x

8x = 24

÷8 on both sides

x = 3 hours

So sorry if im wrong, I did most of the work in my head! Good luck and I hope I helped you!

answer:

total cost for tiles and paints is $924.  

step-by-step explanation:

we have been given that a community hall is in the shape of a cuboid. the hall is 40m long 15m high and 3m wide.

the paint will be required for 4 walls and ceiling.

let us find area of walls and ceiling.

therefore, the area of walls and ceiling is 1410 square meters.

given: cost for 10 litre of paint is $10 and 10 litre paint covers 25 square meter. therefore,

therefore, the total painting cost is $564.

tiles will be required for floor. let us find the area of floor.

given: 1m squared floor tiles costs $3. so,

therefore, the total tiles cost is $360.

now let us find combined total cost of tiles and paint.

therefore, the combined total cost of tiles and paint is $924.