Question

Ken wants to install a row of cerámic tiles on a wall that is 21 3/8 inches wide. Each tile is 4 1/2 inches wide. How many whole tiles does he need?

Answer 1

We have the following:

`a(b)/(c)=(a\cdot c+b)/(c)`

therefore:

`\begin{gathered} 21(3)/(8)=(21\cdot8+3)/(8)=(168+3)/(8)=(171)/(8) \\ 4(1)/(2)=(4\cdot2+1)/(2)=(8+1)/(2)=(9)/(2) \end{gathered}`

now, we divde to know the amount:

`((171)/(8))/((9)/(2))=(171\cdot2)/(8\cdot9)=(342)/(72)=4.75\cong4`

Therefore, the answer is 4 whole tiles