15a. False, because Bobby would have to be 6 feet to be 4 times the size of Kenny.
[tex]4 \times 1 \frac{1}{2} \\ 4 \times \frac{3}{2} \\ \frac{12}{2} \\ 6[/tex]
15b. True, because 1 and a half times 3 is 4 and a half.
[tex]3 \times 1 \frac{1}{2} \\ 3 \times \frac{3}{2} \\ \frac{9}{2} \\ 4 \frac{1}{2} [/tex]
15c. True, because 1 and a half times 5 is 7 and a half.
[tex]5 \times 1 \frac{1}{2} \\ 5 \times \frac{3}{2} \\ \frac{15}{2} \\ 7 \frac{1}{2} [/tex]
15d. False, because Bobby's height times 2 would be 9.
[tex]2 \times 4 \frac{1}{2} \\ 2 \times \frac{9}{2} \\ \frac{18}{2} \\ 9[/tex]
