DSQ: Understanding diagrams - GMAT Quantitative

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Question

Below is a menu of the drinks served at Moonbucks Coffee:

Today and today only, there is a special - buy two espressos and get any third drink free. There are no other specials.

Ralph and Janet are each ordering three beverages from this menu. Who, if either, will pay more?

Statement 1: Two of Ralph's drinks are espressos.

Statement 2: Two of Janet's drinks are cappucinos.

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Answer

Each statement alone gives information about only one order, so at the very least, both statements will be necessary.

From Statement 1, it is known that Ralph will pay for his drinks, since he will only pay for the two espressos.

From Statement 2, it cannot be determined exactly what Janet will pay. However, she will pay for all three drinks, two of which are cappucinos; the least she will spend is the price of two cappucinos and an Americano, which is .

From both statements together, it is definite that Janet will pay more.

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