Question

Helping son with homework and am stumped myself. The answer key has a different answer than I figured. Can someone please show me the work to solve the following problem? If the height of a rectangle is 2/5mm and the perimeter is 20 2/15mm, what is the length of the base of the rectangle? Thank you.

Answer 1

p = 2(l+b)
20 2/15 = 2(2/5 + l)

Answer 2

perimeter = 2 ( length + height)
20 2/15 = 2(2/5+length)

Answer 3

l= 10 1/15 - 2/5

Answer 4

145/15 = 29/3 = 9 2/3

Answer 5

Thank you.