Question

The directions for a weed spray concentrate state that 3 tablespoons of the concentrate should be mixed with 4 gallons of water. How many tablespoons of concentrate need to be mixed with 5 gallons of water?

Answer 1

The given information is:

- 3 tablespoons of the concentrate should be mixed with 4 gallons of water.

The ratio of tablespoons to gallons of water is:

`\frac{3\text{ tablespoons}}{4\text{ gallons of water}}`

Then, we can apply proportions to find how many tablespoons of concentrate need to be mixed with 5 gallons of water, so:

`\begin{gathered} (3)/(4)=(x)/(5) \\ Isolate\text{ x} \\ x=(5*3)/(4) \\ x=(15)/(4) \\ x=3.75\text{ tablespoons} \end{gathered}`

It is needed 3.75 tablespoons of the concentrate.