Let the number is x
According to the question:
Three-fourth of the number is = \(\frac{3x}4\)
Fourth-fifth of the number is = \(\frac{4x}5\)
\(\frac{4x}5\) - \(\frac{3x}4\) = 4
LCM of 5 and 4 is 20
\(\frac{16x-15x}{20}=4\)
x = 80
Therefore number is 80
