Four-fifth of a number is more than three-fourth of the number by 4.

Let the number be $\mathrm{x}$.

According to the question,

$\frac{4}{5} \mathrm{x}-\frac{3}{4} \mathrm{x}=4$

or $\frac{16 \mathrm{x}-15 \mathrm{x}}{20}=4$

or $\mathrm{x}=80[$ After cross multiplication $]$

Thus, the required number is 80 .