Answer:
17.4 mi/gal
Explanation:
What we know:
A car can travel 435 miles on 25 gallons of gas.
First, subtract 10 from 435. Then divide 10 by 25.
435 - 10 = 425
10/25 = 2/5 = 0.4
0.4 is the decimal in your answer.
Divided 425 by 100, then multiply by 4 for the whole portion.
425/100 = 4.25
4.25 * 4
16 + 1
17
Add 17 and 0.4 to get your final answer of 17.4 mi/gal.