375 is a common denominator, but not the least common denominator. The least common multiple of 15 and 25 is 75, so rewrite both fractions with a denominator of 75. The correct answer is $\displaystyle\frac{{10}}{{75}}\usepackage{cmbright}\Huge\$ and $\displaystyle\frac{{3}}{{75}}\usepackage{cmbright}\Huge\$ .