AlgebraEasyTwo lengths from their sum and difference
Algebra practice question
Two planks have a combined length of 13 feet, and one is 3 feet longer than the other. How long, in feet, is the longer plank?
Answer: 8
l + s = 13 and l − s = 3 give l = 8.
Common wrong answers
- If you answered 5
- 5 is the shorter plank.
- If you answered 10
- 10 adds 3 to 13 and halves wrongly; (13 + 3)/2 = 8.
- If you answered 6.5
- 6.5 halves 13.
More Algebra questions
- Easy
If 3x + 7 = 22, what is the value of x? - Easy
If x/4 = 9, what is the value of x? - Easy
The function f is defined by f(x) = 6x − 5. What is the value of f(3)? - Easy
The perimeter P of a rectangle with length l and width w is given by P = 2l + 2w. Which of the following expre… - Easy
Which equation defines the function f? - Easy
In the xy-plane, the graph of the equation y = 4x − 12 crosses the x-axis at the point (a, 0). What is the val…
Not affiliated with the College Board. SAT is a trademark of the College Board.