Verified Answer :

The problem says the car travels 340 miles on 20 gallons so 340/20 
We want to know how much the car can travel with 25 gallons of gas so x/25 
We would use cross multiplication:
\(\frac{340}{20} = \frac{x}{25}\)
From here you would multiply:
\(340*25 =20x\)
Now to solve for x you would start by multiplying 340 25
34025=8500
now we have 
8500=20x
to isolate x we would divide both sides by 20
Final answer: x=425miles 
So the answer is 425miles

find out how much it goes in 5 gallons
20÷4=5
340÷4= 85
add 85 onto 340 to get te answer- 425

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