AlgebraEasy–MediumPrice of a coffee from two orders
Algebra practice question
At a cafe, 2 coffees and 3 teas cost 13 dollars, and 1 coffee and 1 tea cost 5 dollars. What is the price, in dollars, of one coffee?
Answer: 2
With c + t = 5, t = 5 − c, and 2c + 3(5 − c) = 13 gives 15 − c = 13, so c = 2.
Common wrong answers
- If you answered 3
- 3 is the price of a tea.
- If you answered 2.5
- 2.5 halves 5 without using the first order.
- If you answered 6.5
- 6.5 halves 13.
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