Simple Math Problem - It's been a while...

[bluebooger]

cross multiply

just keep your units the same (gallons, miles, grams, light years,
keep them the same and it all works out

Code:

(1.5/30) = (6/x)

1.5 gallons        6 gallons
------------  =   ----------
30 miles           x miles

1.5 * x = 30 * 6

1.5 * x = 180

x = 180/1.5

x = 120