2018 AMC 10A Problem 2

Attempt Problem 2 of the 2018 AMC 10A below, then check your answer against the professionally curated solution from LIVE by Po-Shen Loh. You can also try the full timed exam, view all 2018 AMC 10A solutions, or check the answer key.

All problems are used with official legal permission of the Mathematical Association of America (MAA).

2.

Liliane has 50%50\% more soda than Jacqueline, and Alice has 25%25\% more soda than Jacqueline. What is the relationship between the amounts of soda that Liliane and Alice have?
Liliane has 20%20\% more soda than Alice.
Liliane has 25%25\% more soda than Alice.
Liliane has 45%45\% more soda than Alice.
Liliane has 75%75\% more soda than Alice.
Liliane has 100%100\% more soda than Alice.
Answer: A
Concepts:percentageratio and proportion
Small hint:
Use Jacqueline’s amount as the base variable
Big hint:
Compare Liliane’s amount directly to Alice’s amount
Solution:
Let xx be the number of gallons of soda that Jacqueline has. Then Alice has 1.25x1.25x gallons, and Liliane has 1.5x1.5x gallons.
Therefore, the relationship can be found by dividing the amount of soda that each has to yield 1.5x1.25x=1.2,\dfrac{1.5x}{1.25x}=1.2, which means Liliane has 20%20\% more soda than Alice.
Thus, A is the correct answer.
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