THIS IS A MATH PROBLEM BUT SAYING IT IN MY OWN WORDS!?!

Mathematics

2 answers:

Strike441 [17]4 years ago

5 0

927 is your answer 10.3*90 use a calculator brainliest answer me

Paladinen [302]4 years ago

5 0

Well, then I'm guessing you're only feeding 90 of them since 10 of the dogs are sleeping. If so, then set up a proportion:

$\frac{number of dogs}{amount of food}$

$\frac{100}{10.3}$

A proportion is a two fractions set equal to eachother. So, the second fraction will be the number of dogs over x. X will be the amount of food the dogs will get.

$\frac{90}{x}$

Set the two equations equal to eachother

$\frac{100}{10.3} = \frac{90}{x}$

To solve a proportion, cross multiply

100 x X = 100x

90 x 10.3 = 927

100x = 927

Divide 100

x = 9.27

So, the dogs will receive 9.27 of food

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What is the common denominator denominator of 5/6 & 8/21?

konstantin123 [22]

42 if you multiply 6 and 7 it's 42 and multiply 21 and 2 and it will be 42 so that's the common denominator

5 0

3 years ago

sarah can complete a project in 90 minutes and her sister betty can complete it in 120 minutes if they both work on the project

alukav5142 [94]

Answer:

It will take them approximately 51.43 minutes to complete the project together

Step-by-step explanation:

This is what is called a "shared job" problem.

The best way to work on them is to start by finding the "portion" of the job done by each of the people in the unit of time.

So, for example, Sarah completes the project in 90 minutes, so in the unit of time (that is 1 minute) she completed 1/90 of the total project

Betty completes the project in 120 minutes, so in the unit of time (1 minute) she completes 1/120 of the total project.

We don't know how long it would take for them to complete the project when working together, so we call that time "x" (our unknown).

Now, when they work together completing the entire job in x minutes, in the unit of time they would have done 1/x of the total project.

In the unite of time, the fraction of the job done together (1/x) should equal the fraction of the job done by Sarah (1/90) plus the fraction of the job done by Betty. This in mathematical form becomes:

$\frac{1}{x} =\frac{1}{90} +\frac{1}{120}\\\frac{1}{x} =\frac{4}{360} +\frac{3}{360}\\\frac{1}{x} =\frac{7}{360} \\x=\frac{360}{7} \\x=51.43\,\,min$