Carlos is laying concrete to make the floors of two rooms. The dimensions of the rooms are shown below. He needs to use 0.1m3 of concrete to make 1m2 of floor. The concrete will cost £65 per m3. How much will it cost to buy enough concrete for the floors?

(Rectangle number 1 : 7m by 3m
Rectangle number 2 : 6m by 2m

Clearly the floor is 0.1m thick. So, multiply the volume by the unit cost, and you get a cost of

(7*3 + 6*2)(0.1)(65) = ?

There is no need for you to say 'Clearly'. However, thank you for the answer.

Clearly you were having trouble, as you posted no work of your own.

Aaa

To calculate the cost of the concrete, we first need to determine the total area of the floors in both rooms.

For room 1, the dimensions are 7m by 3m, so the area is calculated by multiplying the length (7m) by the width (3m):

Area of room 1 = 7m × 3m = 21m²

For room 2, the dimensions are 6m by 2m, so the area is calculated by multiplying the length (6m) by the width (2m):

Area of room 2 = 6m × 2m = 12m²

Now, let's add the areas of both rooms to find the total area:

Total Area = Area of room 1 + Area of room 2 = 21m² + 12m² = 33m²

Given that 0.1m³ of concrete is required for each 1m² of floor, we can determine the total volume of concrete required by multiplying the total area (33m²) by the concrete requirement (0.1m³):

Total Volume of Concrete = Total Area × Concrete Requirement = 33m² × 0.1m³ = 3.3m³

Next, we know that the cost of concrete is £65 per m³. So, we can calculate the total cost of the concrete by multiplying the total volume of concrete (3.3m³) by the cost per m³ (£65):

Total Cost of the Concrete = Total Volume of Concrete × Cost per m³ = 3.3m³ × £65/m³ = £214.50

Therefore, it would cost £214.50 to buy enough concrete for the floors of both rooms.