A rectangular feel measures 15m by 20m. A rectangular area is to be fenced in by reducing each dimension by the same amount. The fenced in area will be 1/2 the original area. What will the dimensions of the fenced in area be?

Question

I'm really confused, can someone please explain to me how to solve it? Thank you so much!!

Answer 1

total area: 15*20
If the reduction is x, we have

(15-x)(20-x) = 1/2 * 15*20

Now just find x.