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3 years ago

4/5 of a class is girls and there are 8 boys. How many total in class.

Mathematics

1 answer:

Ann [662]3 years ago

3 0

Answer:

Step-by-step explanation:

a+b=c

a=girls

b= boys

c= total

the statement tell us:

4/5 of a class is girls:

a=(4/5)*c

boys=b=8

c=a+b

so we have:

c=(4/5)*c + 8

c-(4/5)*c=8

(5c-4c)/5 = 8

c/5=8

c=8*5

c=40

total=40

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Six is one hundred times ???????????

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Answer:

$S_{10}=280$

Step-by-step explanation:

Given that,

$t_n=2n+3$ ...(1)

We need to find the value of $S_{10}$ .

Put n = 1 to find the first term.

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Put n = 2 to find the second term.

$t_2=2(2)+3=7$

Put n = 3 to find the third term.

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So, the value of $S_{10}$ is equal to 280.

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3 years ago

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Fynjy0 [20]

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Hey there!

If the price per orange is $.26 and we want to know how many oranges he bought and we have our total, we can set o equal to how many oranges he got and set up an algebraic equation:

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We multiply .26 by o because o is how many oranges he bought and that's what we're solving for- so we multiply by the unit price.

To isolate o, we divide both sides by .26 to get:

The answer is C- Jim bought 8 oranges.

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riadik2000 [5.3K]

Hello,

Yes of course 0.4 or 4/10 is a rational number :)

Have a nice day :)

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