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

[Lindagerr]

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

You can do the same for your last question

cross multiply and divide

875 whatnot 3000 whatnot
------ = ------
70 thingies x thingies

3000 X 70 = 210,000

210,000 divided by 875 = 240

X = 240