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

An engine coolant mixture uses antifreeze concentrate and water in a ratio of $8$ to $64$. How many cups of antifreeze concentrate should be added to $4$ gallons of water to make the coolant in this ratio? ($4$ cups $=$ $1$ quart, $4$ quarts $=$ $1$ gallon.)

A water tank held $12{,}500$ gallons of water. After leaking at a constant rate for $25$ minutes, the tank held $11{,}000$ gallons. How many gallons of water leaked from the tank each minute?

A car travels $390$ miles in $6$ hours. What is the speed in miles per hour?

Parallelograms $EFGH$ and $JKLM$ are similar. The area of parallelogram $EFGH$ is $9\textsf{,}$ and the area of parallelogram $JKLM$ is $36\textsf{.}$ Side $EF$ corresponds to side $JK\textsf{,}$ and $EF = 7\textsf{.}$ What is the length of $JK\textsf{?}$

Sales tax is $10\%$. What is the tax on a $\text{\char36}80$ purchase?

The price of a laptop decreased from $\text{\char36}800$ to $\text{\char36}680$. What is the percent decrease?

Find the simple interest on $\text{\char36}300$ at $4\%$ per year for $1$ year.

Two store locations report inventory and the percent sold. How many more items were sold at the South store than at the North store?
$\begin{array}{l|c|c} \text{Store} & \text{Inventory} & \text{Percent sold} \\ \hline \text{North} & 200 & 25\% \\ \text{South} & 160 & 50\% \end{array}$