The number of gallons g of fuel used on a trip
varies directly with the number of miles m
traveled. if a trip of 270 miles required 12 gallons
of fuel, how many gallons are required for a trip of
400 miles?

17.78 gallons are required for a trip of 400 miles.

Solution:

Given, the number of gallons g of fuel used on a trip varies directly with the number of miles m traveled.  

A trip of 270 miles required 12 gallons of fuel,  

We have to find how many gallons are required for a trip of 400 miles?

now, according to given information,  

270 miles ⇒ 12 gallons

400 miles ⇒ "g" gallons

So, by chris cross method

= 17.77 ≈ 17.8

Hence, 17.8 gallons are required for 400 miles.

hi, i am not sure about this one but i think its d,

hope this !