Algebra practice question

Answer: 16

Let the number be x: x + x/2 = (3/2)x = 24, so x = 24 × 2/3 = 16. Check: 16 + 8 = 24.

Common wrong answers

If you answered 8

8 is half of the answer — the 'half' part, not the number.

If you answered 12

12 is 24/2, treating the sum as twice the number; it is one and a half times the number.

If you answered 48

48 is 24 × 2, as if the number were twice the sum.

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?