The total length of the wall is
[tex]l=16\frac{1}{4}m=\frac{65}{4}m[/tex]the artist paint the star in every 18/20 meter,
so the total number of the stars are,
[tex]\frac{(\frac{64}{5})}{\frac{18}{20}}[/tex][tex]\frac{64\times20}{5\times18}=14.22[/tex]so the number of stars will be an integer. so we will round it
so the answer is 14 star.