Question

Suppose 1.5 liters of water come out of a faucet each minute. For how many minutes was the faucet on if 18.6 liters of water came out?

Answer 1

`12.4` minutes

Explanation:

Define your variables.
`x=`minutes
`y=`liters of water

Set up an equation.
For every `x` minutes, `y` liters of water will come out.
`y=1.5x`

Substitute `y` for `18.6` to solve for `x`, the number of minutes.
`18.6=1.5x`
`x=12.4`

Answer: The faucet was on for `12.4` minutes.