Question 326598
We are given the relation:    Area of pic = constant * d^2,  where d is distance from projector to wall.

For d = 10, we have A = 16 ft sqrd
Now  given d = 20  what is A?

constant = 16/10*10

new A = [16/100] * 20*20  = 16 * 4 = 64 ft sqrd.

Answer the new picture is 64 ft squared.