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Zinaida [17]
3 years ago
11

How do I solve 3 1/2r = 28

Mathematics
2 answers:
lozanna [386]3 years ago
7 0
3 1/2r=28
7/2r=28
r=(28/1)(2/7)
r=8
juin [17]3 years ago
6 0
You divide 3 1/2 on both sides, which means your answer is r = 28 divided by 3 1/2, or 8.
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Same case as Pablo's, more or less.

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\bf \begin{cases}
\boxed{b}=a+150\\
0.07a+0.095b=303\\
----------\\
0.07a+0.095\left(\boxed{a+150}  \right)=303
\end{cases}
\\\\\\
0.07a+0.095a+14.25=303\implies 0.165a=288.75
\\\\\\
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8 0
3 years ago
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