AlgebraEasy–MediumPrice of a pen from two purchases
Algebra practice question
One pen and two pencils cost $2.10. Two pens and one pencil cost $2.70. What is the cost, in dollars, of one pen?
Answer: 1.1 or 1.10
Adding the two purchases gives 3 pens + 3 pencils = $4.80, so a pen and a pencil cost $1.60; then a pen costs 2.70 − 1.60 = $1.10.
Common wrong answers
- If you answered 0.5
- 0.5 is the price of a pencil.
- If you answered 1.6
- 1.6 is the price of one pen plus one pencil.
- If you answered 0.9
- 0.9 subtracts the two totals as if that gave a pen.
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