Question

Jerry is tiling the wall behind his sink. The tiles he's using are square with sides that measure 1 3/4 inches. If the area of wall he's tiling is 42 inches long and 29 3/4 inches high, how many tiles will he need?

Answer 1

S=42*(29 3/4)=4998/4 square inches is square of the wall
4998/4 / (7/4)² = 408 tiles he need
Jerry need 408 tiles for the wall he tiling

Answer 2

First you should find the area of wall he's tiling. You can do it by multiplying its length and height.

`$A_w={L}\cdot{H}=42\cdot29(3)/(4)=1249(1)/(2)=1249,5$`

After that, the area of one tile.

`$A_t=L^2=(1(3)/(4))^2=3(13)/(16)=3,0625$`

And now remains only to divide area of the wall by area of one tile and that will give us the answer.

`$N=(A_w)/(A_t)=(1249,5)/(3,0625)=408$`