Is there suppose to be a link or something more to this question?
Answer:
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Step-by-step explanation:
I think Its 6.............
Let us convert the percentages to decimal format first.. so 5% is just 5/100 or 0.05 and 15% is just 15/100 or 0.15
so hmmm, so, let's say it needs "x" amount and "y" amount of each respectively, so, whatever "x" and "y" are, they must add up to 100, and whatever their concentration is, must add up to what the mixture yields
thus

solve for "x"
what's "y"? well, y = 100 - x
There is not enough information to answer the question. To answer it, you need to know how much gas is in her gas tank and how far she needs to travel.