# Algebra problem dealing with lengths

• Jan 5th 2011, 06:29 PM
Dragonnic
Algebra problem dealing with lengths
If [ a ] = 5 cm , and [ b ] = 3a cm , find [ a + b ]

$\displaystyle a = 5, b=3a= 3\times 5 = 15 \implies a+b = 5+15=\dots$