How many square tiles of side 10cm each will be needed to tile a floor which is 300cm long and 150cm wide? attach photocopy of your notebbok with your answer..

Step 1

Find the area of one tile

we know that

the area of a square is

where b is the length side of the square

In this problem

Substitute

Step 2

Find the area of the floor

The area of a rectangle is equal to

where

L is the length of the rectangle

h is the width of the rectangle

In this problem

Substitute

Step 3

Find the number of tiles needed

by proportion

therefore

the answer is

to determine the unit cost your would divide the total cost by the number sold.

7 bagels for $4.41       $4.41/7 = $.63 each at fresh side

5 bagels for $3.60         $3.60/5 = $.72 each at value mart