The R- Value of a 1- In

Multiple Choice

The R- value of a 1- in.- thick extruded polystyrene board is 5.0. If the R- value of a 1- in.- thick brick wall is 0.2, how thick should the brick wall be to equal the R- value of 1- in.- thick extruded polystyrene?

A) 50 in.
B) 10 in.
C) 5 in.
D) 2.5 in.
E) None of the above