Algebra problem dealing with lengths

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January 5th 2011, 06:29 PM
Dragonnic

Algebra problem dealing with lengths

If [ a ] = 5 cm , and [ b ] = 3a cm , find [ a + b ]

ANSWER=(Crying)
January 5th 2011, 06:31 PM
pickslides

$\displaystyle a = 5, b=3a= 3\times 5 = 15 \implies a+b = 5+15=\dots$
January 5th 2011, 06:34 PM
Dragonnic

the answer is?
January 5th 2011, 07:32 PM
pickslides

Take a guess, i dare you!

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