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aleksley [76]
3 years ago
9

If the ratio of boys to girls in a classroom is 2:3 and there are 10 boys, how many girls are there? Please answer thank you!

Mathematics
2 answers:
MakcuM [25]3 years ago
7 0
Answer:
15 girls

Explanation:
We know that the ratio of boys to girls in the classroom is 2:3, meaning that for every 2 boys there are 3 girls.

Now, we can set up a proportion to solve this problem.

Please see the picture attached.

I hope this helps!

weqwewe [10]3 years ago
5 0

Answer:

there are 15 girls in a classroom

Step-by-step explanation:

lets make it simple and short.

given:

ratio of boys to girls in a classroom is 2:3

there are 10 boys in a class room

find:

how many girls are there?

<u>use ratio and proportion</u>

<u>  2   </u>  =  <u>  3     </u>

  10       girls  

2*girls = 10 * 3

2 girls = 30

girls = 30 / 2

girls = 15

therefore,

there are 15 girls in a classroom

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Explanation:
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46 + (x - 3) + (y - 3) = 180 .

46 + 1(x - 3) + 1(y-3) = 180 .

46 + 1x - 3 + 1y - 3 = 180 .

46 - 3 - 3 + 1x + 1y = 180 .

40 + x + y = 180 ;

Subtract "40" from EACH SIDE of the equation:
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 40 + x + y - 40 = 180 - 40 ;

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x + y = 140 ;
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Now:
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65 = (x - 3) ;


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Add "3" to EACH SIDE of the equation;

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Now:

Since:  "x + y = 140" ;

Let us plug in our known value, "68" ;  for "x" ;

to solve for "y" ;
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   x + y = 140 ;
 
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↔ y + 68 = 140 ;

Subtract "68" from EACH SIDE of the equation; to isolate "y" on one side of the equation; and to solve for "y" ;
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   y + 68 - 68 = 140 = 68 ;

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So,  solve for "x" and "y".

x = 68, y = 72 .
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3 years ago
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12 is what percentage of 80
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Answer:  " 15 % " .

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     →   " 12 is <u>  15% </u> of 80 " .

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Step-by-step explanation:

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12 = (n/100) * 80 ;

12 = (80n) /100 ;  Solve for "n:

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Multiply each side of the equation by "10" ; to get rid of the "decimal" ;

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8n = 120 ;

Divide each side of the equation by "8" ;

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to get:

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n = 15 .

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Answer:  " 15 % " .

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     →   " 12 is <u>  15% </u> of 80 " .

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Hope this helps!

Best wishes!

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4 0
3 years ago
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