Algebra practice question

Answer: 7

u + l = 12 and u = l + 2 give 2l + 2 = 12, so l = 5 and u = 7.

Common wrong answers

If you answered 5

5 is the lower shelf.

If you answered 6

6 halves 12, ignoring the difference.

If you answered 10

10 subtracts 2 from 12 without halving.

More Algebra questions

• Easy–Medium
  A line passes through the points (0, 3) and (2, 7). What is the slope of the line?
• Easy–Medium
  A gym charges a $25 one-time signup fee plus $15 per month. Which equation gives the total cost C, in dollars,…
• Easy–Medium
  If 5(x − 2) = 3x + 4, what is the value of x?
• Easy–Medium
  A taxi charges a $3.50 base fare plus $2.25 per mile. If a ride costs $19.25 total, how many miles was the rid…
• Easy–Medium
  The equation of a line is 3x + 2y = 12. What is the y-coordinate of the point where the line crosses the y-axi…
• Easy–Medium
  A line in the xy-plane passes through the points (1, 5) and (4, 11). What is the y-intercept of the line?