Prealgebra (7th Edition)

Published by Pearson
ISBN 10: 0321955048
ISBN 13: 978-0-32195-504-3

Chapter 3 - Section 3.4 - Linear Equations in One Variable and Problem Solving - Exercise Set: 47

Answer

There are 195,140 thousand personal computers in China. There are 310,640 thousand personal computers in the US.

Work Step by Step

Let $c$ be the personal computers in China. The personal computers in the US are $c+115500$. $c+(c+115500)=505780$ $\longrightarrow$combine like terms $2c+115500=505780$ $\longrightarrow$addition property $2c+115500-115500=505780-115500$ $\longrightarrow$simplify $2c=390280$ $\longrightarrow$multiplication property $2c\div2=390280\div2$ $\longrightarrow$simplify $c=195140$ $c+115500=195140+115500=310640$
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