Imagine Becca as x, Al as 2x (Since he is twice as tall), and Jim as 2x+3 (since he is 3 inches taller than Al). Then make an equation out of their values and set it equal to 199.
x+(2x)+(2x+3)=199 5x+3=199 5x=196 x=39.2
Now we know that Becca is 39.2 inches so now plug in 39.2 for x in Jim's number.