A community hall is in the shape of a cuboid the hall is 40m long

2172 is the total cost

Cost for tiles: 1800

cost of paint: 372

Find the surface area of the wall without floor:(for cost of paint)

40 x 15 + 40x3x2 + 15x3x2 = 600 + 240 + 90 = 930

Cost: 930/25 x 10 = 372

Find area of floor:(to find cost of tiles)

40 x 15 = 600m^2

cost: 600 x 3 = 1800pounds

add them if needed

Hope this helps

Good Luck

Question 1:

For this case we must solve the following system of equations by the method of elimination:

We multiply the first equation by 2:

We have the equivalent system:

We add the equations:

We divide between 5 on both sides of the equation:

We find the value of the variable "x":

We divide by 8 on both sides of the equation:

Thus, the solution of the system is:

Question 2:

For this case we must solve the following system of equations by the method of elimination:

We multiply the first equation by 10:

We multiply the second equation by -4:

We have the equivalent system:

We add the equations:

We divide by -70 on both sides of the equation:

We find the value of the variable "y":

We divide between -4 on both sides of the equation:

Thus, the solution of the system is: