Section: Math

87) A rectangle with a perimeter of 30 centimeters is twice as long as it is wide. What is the area of the rectangle in square centimeters? 

1. 20
2. 30
3. 40
4. 50

Answer 4 is correct. Perimeter is determined by adding the four sides. Since rectangles will always consist of two pair of equal sides, the two long sides added to the two short sides must equal 30. We also know that one pair will be twice as long as the other pair. (2x+2y=30, or x+y=15). Now think multiples of 15. Five (5) comes immediately to mind. Sub it for one of the variables. 5+y=15, or y=10. Is 10 twice as long as 5 and do the two equal 15? Yes, they do. Now that you have your side measurements, multiply them to get the area in square centimeters. Fifty (50) is your answer.