Question

1tank of propane holds 5 gallons. 1 tank will last 12 hours. how many tanks will I need to to last 30 days if i use 8 hours a day.

Answer 1

The answer would be 20

Answer 2

if you are using the tank 8 hours a day for 30 days

that is 8*30 = 240 hours

1 tank x tanks

---------- = -------------

12 hours 240 hours

using cross products

1 * 240 = 12 * x

240 = 12 x

divide each side by 12

240/12 = 12x/12

20 = x

You will need 20 tanks