A cookie recipe calls for 3 cups of flour and 2 cups of sugar. While making the cookies, Francisco accidentally uses 4 cups of flour. How many cups of sugar are needed to maintain the same ratio of flour to sugar?
A.2(1/3) cups of sugar
B.2(2/3) cups of sugar
C.3 cups of sugar
D.6 cups of sugar
Choice B is correct. The recipe calls for a 3:2 ratio of cups of flour to cups of sugar. Set up a proportion to determine how many cups of sugar, s, Francisco should use if he uses 4 cups of flour:
Solving this equation for s yields:
s=4/3*2=8/3=2(2/3) cups of flour
Francisco should use 2(2/3) cups of flour to maintain the same ratio of flour to sugar.
Which of the following is equivalent to the expression above?
Choice C is correct.
At a certain gas station in France, one liter of gas cost 1.45 euros on a certain day. At the time of a purchase, 1 euro was worth $1.35. Given that 1 gallon is approximately 3.785 liters, what was the approximate cost, in dollars, of one gallon of gas on that day?
Choice D is correct.