The length and width of one sheet of iron together are 2130mm. What is the area of the sheet if the length is 2 times the width?

Let the width of the sheet be x mm, then its length is 2 mm.
x + 2x = 2130.
3x = 2130.
x = 2130: 3.
x = 710.
For x we took the width of the rectangle. Let’s calculate the length of the rectangle:
1) 710 * 2 = 1420 mm.
We calculate the area of the sheet using the formula the product of its length and width:
2) 710 * 1420 = 1008200 mm2
Answer: sheet area 1008200 mm2 (10082 cm2)