If the price of gasoline at a particular station in europe is 5 euros per liter. an american student in europe is allowed to use 40 euros to buy gasoline. knowing that 4 quarts make a gallon, and that 1 liter is about 1 us liquid quart, about how many gallons can the student buy?

Number of gallons =2 gallon

Explanation:

given data:

rate of gasoline ineurope = 5 euro per liter

total money to buy gasoline =  40 euro

total gasoline an american can buy in europe

= 8 litres of gasoline

As given in the question 1 ltr is 1 quarts therefore  

Total no. of quarts is 8 quarts

As from question 4 quarts is equal to one gallon, hence

Number of gallons

this could be newton#'s law of cooling. the cooling curve is exponential