Non-void Method exercise
Write a method called getBMI that calculates a person’s Body Mass Index. The formula is: BMI = Weight (lb) / (Height (in) x Height (in)) x 703
Example : Someone who is 5'6" (5'6" = 66") and weights 160 lb has a BMI of 160 / (66 x 66) x 703 = 25.8 

In your main program, print the following 2 lines:

At 66” and 160lb, Ted has a bmi of 25.8

At 55” and 160lb, Mary has a bmi of <whatever it returns>

Extra: Mary and Ted together have an average bmi of ??