Question

If a car travels 340 miles on 20 gallons of gas, how far can it travel on 25 gallons of gas?

Answer 1

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
340*25=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

Answer 2

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