Solve Simplify the Answer $2 \frac { 1 } { 2 }$

Multiple Choice

Solve. Simplify the answer.
-To obtain a certain shade of paint, Peter mixed 10 gallons of white paint with $2 \frac { 1 } { 2 }$ gallons of brown paint and 3 gallons of blue paint. How much paint did he have?

A) $\frac { 5 } { 21 } \mathrm { gal }$
B) $15 \frac { 1 } { 2 } \mathrm { gal }$
C) $\frac { 2 } { 31 } \mathrm { gal }$
D) $4 \frac { 1 } { 5 } \mathrm { gal }$