Hi,

David's gas tank is 1/6 full. 

After he buys 7 gallons of gas, it is 1/2 full.  2/6 = 1/3 of Tank is 7 gal

Gas Tank is a 21 gal tank 

Answer by richwmiller(17219)   (Show Source): You can put this solution on YOUR website!
 x/6+7=x/2

multiply by 12

2x+84=6x

84=4x

21=x

check

21/6+7=21/2

10.5/3=10.5-7

10.5=3.5*3

ok



 

Answer by 55305(86)   (Show Source): You can put this solution on YOUR website!
 Lets start with what fraction of the tank he filled with gas. So 1/2-1/6= 3/6-1/6= 2/6= 1/3    So he bought 1/3 as many gallons as the tank holds, which is 7 gallons. So that means his tank must hold 21 gallons. 

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