Question

Please help!!1) The floor tiles come in red,blue and black. There are 16 red, 5 blue and 4 black. What percent of the tilesare black?2) Frank walks to school 35% of the time. If there are 180 days in a school year, how many days did he walk to school?

Answer 1

1) we have

$16+5+4=25$

25 tiles in total and 4 black tiles, then

25 ---> 100%

4 -----> x

$\begin{gathered} 25\times x=4\times100 \\ 25x=400 \\ \frac{25x}{25}=\frac{400}{25} \\ x=16 \end{gathered}$

answer: 16 % of the tiles are black