KSA Grade 7 Ratios and Proportional Relationships. Practice it free.

Similar triangles $RST$ and $UVW$ have perimeters $28$ and $42\textsf{.}$ Side $RS$ corresponds to side $UV\textsf{,}$ and $RS = 10\textsf{.}$ What is the length of $UV\textsf{?}$

A $\text{\char36}200$ shirt is on sale for $25\%$ off. What is the sale price?

A town's population increased from $12{,}000$ to $13{,}800$. What is the percent increase?

Find the simple interest on $\text{\char36}100$ at $5\%$ per year for $1$ year.

Three purchases are taxed at the rates shown. What is the total cost including tax?
$\begin{array}{l|c|c} \text{Item} & \text{Price} & \text{Sales tax} \\ \hline \text{Book} & \text{\char36}40 & 5\% \\ \text{Headphones} & \text{\char36}60 & 8\% \\ \text{Cable} & \text{\char36}20 & 10\% \end{array}$

Windshield washer fluid is mixed with concentrate and water in a ratio of $7$ to $56$. How many cups of concentrate should be added to $3$ gallons of water to make the fluid in this ratio? ($4$ cups $=$ $1$ quart, $4$ quarts $=$ $1$ gallon.)

A paint mixture uses red and blue paint in a ratio of $4$ to $7$. How many ounces of blue paint are needed to mix with $32$ ounces of red paint?

Solve for $x$: $\dfrac{9}{63} = \dfrac{6}{x}$.