AlgebraMediumCoffees sold from a mixed total
Algebra practice question
A cafe sold 40 cups of coffee and tea in total for $150. A coffee costs $4.50 and a tea costs $3. How many coffees were sold?
Answer: 20
4.5c + 3(40 − c) = 150 gives 1.5c = 30, so c = 20.
Common wrong answers
- If you answered 10
- 10 halves the answer.
- If you answered 40
- 40 is the total number of cups.
- If you answered 33.33
- 33.33 divides 150 by 4.50, ignoring the teas.
More Algebra questions
- Medium
A system: 2x + y = 11 and x − y = 1. What is the value of x + y? - Medium
Which of the following describes all solutions to 4x − 9 ≤ 2x + 5? - Medium
A phone's battery percentage is modeled by P = 100 − 8t, where t is the number of hours since it was unplugged… - Medium
If y = 2x − 1 and 3x + y = 14, what is the value of x? - Medium
If |2x − 3| = 7, what is the sum of all possible values of x? - Medium
Line k has equation y = (2/3)x + 1. Which equation represents a line perpendicular to line k?
Not affiliated with the College Board. SAT is a trademark of the College Board.