This answer gives the correct total number of items sold, but not the correct total revenue. Twenty-four apple pies sell for $\displaystyle{24}\cdot{10}={240}\usepackage{cmbright}\Huge\$ dollars, while 15 blueberry pies sell for $\displaystyle{15}\cdot{14}={210}\usepackage{cmbright}\Huge\$ dollars. This would be a total of $450, not $458. The correct equations with which to start the problem are:

(A) $\displaystyle{a}+{b}={39}\usepackage{cmbright}\Huge\$

(B) $\displaystyle{10}{a}+{14}{b}={458}\usepackage{cmbright}\Huge\$