In the Malagasay Indian tribes, it is against the law for a son to be taller than his father. If a son is taller, he must give his father money or an ox. Suppose a father is 5 feet 10 1/2 inches tall and his son 5 feet 6 3/4 inches tall. How many more inches can the son grow before he is as tall as his father?

Subtract 5'-6 3/4" from 5'-10 1/2"

=10 1/2" - 6 3/4"
=9 3/2" - 6 3/4"
=3" + 6/4" - 3/4"
=3 3/4"