Jim is 3 inches taller than Al, and Al is twice as tall as Becca. How tall is Jim if the sum of their heights is 199 inches?

Jim is 81.4 inches tall

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.

2x+3

2 (39.2) + 3

78.4+3

81.4

Jim is 81.4 inches tall