4.04/4.05 Applications of Ratios and Percents

 $\frac{500\ sq\ feet}{40\ days}=\frac{x}{1\ day}$  

 $\frac{500\ ft^{2\ }}{40\ days}=\frac{12.5\ ft^{2\ }}{1\ day}$  

 $\frac{12.5\ ft^{\ 2}}{1\ day}=\frac{800\ ft^{2\ }}{x\ days}$  

 $\frac{\frac{1}{4}month}{\frac{1}{3}of\ the\ lab}$  is the rate that we are working with. 

We want to find out how much it would take for 1 month so we will divide using KCF (Keep, Change, Flip)

 $\frac{1}{4}\ month\div\ \frac{1}{3}lab\ =\ \frac{1}{4}\ \times\ \frac{3}{1}\ =\ \frac{3}{4}$  month! 

If 3/4 of a ton of sand covers 1/5 of a playground, how many tons of sand are required to cover the entire playground?

 $\frac{\left|20-26\right|}{20}\times100$  

 $\frac{\left|-6\right|}{20\ }\times100\ =\ \frac{6}{20}\ =\ 0.3\ \times100\ =\ 30\%$ 


No, he is not because he only spent 30% more time.  

Jamie read 50 pages of her 400-page book in 6 hours. At this rate, how long will it take her to read the entire book?

 $\frac{1}{5}\div\ \frac{1}{3}\ =\ \frac{1}{5}\ \times\ \frac{3}{1}\ =\ \frac{3}{5}hours$