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3 years ago

There are 25 students in class 2-11 and 20% wear glasses. How many wear glasses?

Mathematics

2 answers:

ryzh [129]3 years ago

4 0

Answer:

Five students wear glasses.

Step-by-step explanation:

20 percent of 25 is 5

Dmitrij [34]3 years ago

4 0

We are given that 25 students in the class and 20% wear glasses.

Take 20% of 25 to calculate how many students wear glasses.

$25 \times 20 \%=25 \times 0.20$

$= 5$

5 students in class 2-11 wear glasses. Let me know if you have any questions, thanks!

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Alenkinab [10]

Answer:

Prime number are a multiples of 8 because there are multiples of 8

Step-by-step explanation:

The multiples of 8 are 8, 16, 24, 32, 40, 48, 56, 64, 72, 80

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4 years ago

He donated half money to the food bank. How many does he have?

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3 years ago

The sum of the three numbers is 180. The first number is 10 more than the mean of the three numbers and the second number is 4 l

4vir4ik [10]

Answer:

The third number (c) is 54.

The other ones are 70 and 56.

Step-by-step explanation:

We have 3 numbers, let's call them a, b and c.

We know that the sum of the three numbers is 180, thus:

$a+b+c=180$

We also know that the first number is 10 more than the mean of the three numbers <em>(Note: the mean is the sum of the numbers divided by the number of numbers).</em> Thus:

$a=\frac{a+b+c}{3} +10\\a=\frac{a+b+c+30}{3} \\3a=a+b+c+30\\2a=b+c+30$

Finally the second number is 4 less than the mean:

$b=\frac{a+b+c}{3}-4\\b=\frac{a+b+c-12}{3} \\3b=a+b+c-12\\2b=a+c-12$

Now we have our set of equations and we can proceed to solve them:

$a+b+c=180\\2a=b+c+30\\2b=a+c-12$

Solving for a in our first equation we have: $a=180-b-c$ and substituting this in our second equation we have:

$2a=b+c+30\\2(180-b-c)=b+c+30\\360-2b-2c=b+c+30\\330=3b+3c\\110=b+c$

Now taking this last result into our first equation we have:

$a+b+c=180\\a+(b+c)=180\\a+110=180\\a=70$

Now we are going to solve for b in our second equation and substitute this in our third equation: $b= 180-a-c$

$2b=a+c-12\\2(180-a-c)=a+c-12\\360-2a-2c=a+c-12\\372=3a+3c\\124=a+c$

But we know that a =70, so we can substitute it in our last line:

$124=a+c\\124=70+c\\54=c$

Now we just need to find b and we can use our first original equation to do this:

$a+b+c=180\\70+b+54=180\\124+b=180\\b=180-124\\b=56$

8 0

4 years ago

Solve for x. <br> (13x + 12)

eduard

Answer:

=13x+12

Step-by-step explanation:

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3 years ago