Let
x------> height of Leon's older brother
y------> height of Leon
Convert mixed number to an improper fraction
\(4\frac{3}{4}\ ft=\frac{4*4+3}{4}= \frac{19}{4}\ ft\)
we know that
\(x=\frac{19}{4}\ ft\) -----> equation A
\(y=x-\frac{1}{3}\) -----> equation B
substitute equation A in equation B
\(y=\frac{19}{4}-\frac{1}{3}=\frac{53}{12}\ ft\)
Convert to mixed number
\(\frac{53}{12}=\frac{48}{12}+\frac{5}{12}=4\frac{5}{12}\ ft\)
therefore
the answer is
\(4\frac{5}{12}\ ft\)
