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September 20, 2014

September 20, 2014

Posted by **Jen** on Wednesday, March 23, 2011 at 7:31pm.

- math -
**jai**, Wednesday, March 23, 2011 at 9:36pmlet x = number of gallons the when tank is full

according to first statement, initially the tank is 1/5 full. thus we can write it as (1/5)x

according to second statement, he bought 6 gallons, thus we add 6 to the initial amount, and it becomes 7/10 full or (7/10)x

rewriting using equations:

(1/5)x + 6 = (7/10)x

solving for x,, first we multiply both sides of the equation by 10 to get rid of denominators and deal with whole numbers:

10*(1/5)*x + 6*10 = 10*(7/10)*x

2x + 60 = 7x

60 = 5x

x = 12 gallons

hope this helps~ :)

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