A watercolor painting is 15inches long by 9 inches wide. Ramon makes a border around the watercolor painting by making a mat that adds 3 inches to each side of length and width. What is the area of the mat?

81 in

Step-by-step explanation:

The watercolor painting area:

width x length = the formula for the area of a rectangle.

9 x 15= 135

The mat area:

15 + 3= 18

9 + 3= 12

12 x 18 = 216

216 - 135 = 81

this is answer of 144 cubic meters

it is contrapositive

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