You do not add the same number to the numerator and denominator. To find equivalent fractions, multiply or divide the numerator and the denominator by the same number. In this case use 8, because $\displaystyle{4}\cdot{8}={32}\usepackage{cmbright}\Huge\$ . The correct answer is: $\displaystyle\frac{{24}}{{32}}\usepackage{cmbright}\Huge\$