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4 years ago

7

Answer 1/5d + 1/8d=2

2 answers:

klemol [59]4 years ago

7 0

$\frac{1}{5}d+\frac{1}{8}d=2\\\\
Make\ common\ denominator\ of\ \frac{1}{5}\ and\ \frac{1}{8}\ which\ is\ 40:\\\\
\frac{8}{40}d+\frac{5}{40}d=2\ \ \ |*40\\\\8d+5d=2*40\\\\
13d=80\ \ |:13\\\\d=\frac{80}{13}=6\frac{2}{13}\\\\
Answer\ is\ d=6\frac{2}{13}.$

AysviL [449]4 years ago

4 0

I thought you're saying that the <em>denominators</em> are 5d and 8d.

If so, then the common denominator is 40d, and 'd' turns out to be 13/80 .

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