When n liters of fuel was added to a tank that was already f

问题描述:

When n liters of fuel was added to a tank that was already full,the tank was filled to of its capacity.In terms of n,what is the capacity of the tank,in liters?
1个回答 分类:英语 2014-09-17

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When n liters of fuel was added to a tank that was already 1/3 full,the tank was filled to 7/9 of its capacity.In terms of n,what is the capacity of the tank,in liters?
when n litres of fuel is added
Now new capacity =(1/3)x +n=(7/9)x
n=(7/9)x-(1/3)x
n=x(7/9-1/3)
n=x(7-3/9)
n=x(4/9)
x=9n/4 is the answer hence D is the option
 
 
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