<PRE><B>Question 262824</B>
right now we are at 1/8 full
15 gallons got us up to 3/4 = 6/8.
This means 15 gallons is the same as 5/8 tank.
We can create a proportion to get our answer as
{{{15/(5/8) = G/1}}}
step 1 - cross multiply to get
{{{15 = (5/8)G}}}
step 2 - multiply 15 by (8/5) to get
{{{24 = G}}}
So, 24 - 15 = 9 gallons to fill the tank.</PRE>