Question

if certain motorist drives 25 miles at 20 miles per gallon and 60 miles at 12 miles per gallon,find the average number of miles per gallon?​

Answer 1

Answer:

13.6

Step-by-step explanation:

if certain motorist drives 25 miles at 20 miles per gallon and 60 miles at 12 miles per gallon,find the average number of miles per gallon?​

25 miles at 20 miles/gallon

=> 25 miles in  25/20 = 1.25 gallon

60 miles at 12 miles per gallon

=> 60 miles in 60/12 = 5 gallon

total miles = 25 + 60 = 85 miles

Total Gallon = 1.25 + 5 = 6.25 gallon

Average miles per gallon = 85/ 6.25 = 13.6

Answer 2

answer : 13.6miles per gallon

A certain motorist drives 25 miles at 20 miles per gallon.

so, number of gallons of petrol is used for 25 miles = 25 miles/(20 miles per gallon)

= 25/20 = 1.25 gallons.

again, motorist drives 60 miles at 12 miles per gallon.

so, number of gallons of petrol is used for 60 miles = 60miles/(12 miles per gallon)

= 60/12 = 5 gallons.

so, total number of gallons of petrol is used = 1.25 gallons + 5 gallons = 6.25 gallons.

and total distance covered by motorist = 25 miles + 60 miles = 85 miles

now, average number of miles per gallon = (total distance covered by motorist)/(total number of gallons of petrol is used)

= (85 miles)/(6.25 gallons )

= 13.6 miles per gallon