3 years ago

PLEASE HELP ME ILL GIVE YOU 15

Mathematics

2 answers:

rodikova [14]3 years ago

6 0

Answer:

Step-by-step explanation:

xxMikexx [17]3 years ago

4 0

Answer:

I believe that it is d .

correct me if I'm wrong

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Theo can paint a fence three times as fast as his sister can. Working together, they can paint a fence in 9 hours. How many hour

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Step-by-step explanation:

Let Theo's siste can paint a fence in x times

Given.

Theo can paint a fence three times as fast as his sister can. Working together, they can paint a fence in 9 hours.

$\frac{1}{x}+\frac{1}{3x} =\frac{1}{9}\\\frac{3+1}{3x} =\frac{1}{9} \\\frac{4}{3x}=\frac{1}{9}$

Apply cross multiplication

$x=\frac{9\times 4}{3}\\x=\frac{36}{3} \\x=12hours$

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