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3 years ago

5T-10R=25 solve for R

Mathematics

1 answer:

Rudik [331]3 years ago

8 0

$5t - 10r = 25 \\ - 10r = 25 - 5t \\ r = \frac{25 - 5t}{ - 10} \\ r = \frac{5 - 5t}{ - 2}$

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3 years ago

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3 years ago

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pantera1 [17]

To solve this, we are going to use the work-rate formula: $\frac{1}{t_{1} } + \frac{1}{t_{2}} = \frac{1}{t}$
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$t_{2}$ is the time the assistant takes to grade the homework papaers
$t$ is the tame they take to grade the homework papers working together

Remember that there are 60 minutes in in hour, so 1 hour equals 60 minutes; therefore $t_{2}=60$ . We also know that If the teacher helps the grading can be completed in 20 minutes, so $t=20$ . Lets replace those values in our formula:
$\frac{1}{t_{1} } + \frac{1}{t_{2}} = \frac{1}{t}$
$\frac{1}{t_{1} } + \frac{1}{60} = \frac{1}{20}$
$\frac{1}{t_{1} } = \frac{1}{20} - \frac{1}{60}$
$\frac{1}{t_{1} }= \frac{1}{30}$
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We can conclude that the teacher will take 30 minutes to grade the homework papers.

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4 years ago

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navik [9.2K]

To answer the question above, we have to use this equation. This problem is simple,
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then simplify the equation
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Then the answer would be.
3.464
I hope I helped you with your problem. Have a nice day</span>

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3 years ago