# Bob's shower uses 18 gallons of water every 3 minutes. How many gallons of water does Bob use if he takes a 13 minute shower?

Jun 1, 2018

$78$ gallons of water

#### Explanation:

Given that Bob's shower uses $18$ gallons of water every $3$ minute,

Hence,
$3$ minutes $\to$ $18$ gallons

$1$ minutes -> ?  gallons

$\therefore$ In $1$ minute $\left(\frac{18}{3}\right)$ gallons of water would be used.

$\left(\frac{18}{3}\right) = 6$

$\therefore 6$ gallons of water per minute is used by Bob's shower.

So, how much water would be used in $13$ minutes,

$1$ minute $\to$ $6$ gallons

$\therefore 13$ minutes $\to$ (6 x 13)

(6 x 13) = 78

Hence, $78$ gallons of water would be used by Bob while using his shower.