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The difference between the heights of Peter and Celso
5 \frac{2}{5} -4 \frac{3}{4}

Change to mixed number:
27/5 - 19/6

Change the dissimilar fractions to similar fraction. Find the LCD.
The LCD is 30.

162/30 - 95/30 = 67/30   or   2  \frac{7}{30}

Peter is taller by  2 \frac{7}{30} feet.