The length of a rectangle is inversely proportional to its width having its fixed area. If the length of a rectangle is 10 ft. When the width is 4 ft. , find

Question

length of the rentangle if the width is 8 ft. ?

Answer 1

l=k/w is inverse proportion

10=k/4

k=4*10

k=40

l=40/8

l=5 feet

or,...

A=l*w

A=10*4=40 sq ft

A=l*8

40=l*8

l=40/8

l=5 ft again