Job Recruitment Website - Property management - Find a math problem in grade five. (The process should be detailed, O(∩_∩)O Thanks in advance.

Find a math problem in grade five. (The process should be detailed, O(∩_∩)O Thanks in advance.

Adding 15m to the upper bottom becomes a parallelogram, which means that the lower bottom of the trapezoid is 35+ 15 = 50m.

When the area increases 135m, the height of the trapezoid is: 135*2 divided by 15 = 18m.

So the original trapezoidal area: (15+50)* 18 divided by 2=65* 18 divided by 2=585 square meters.