SOLUTION: In a school having 990 students 12 out of 27 are girls. How many boy students are there

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Question 471165: In a school having 990 students 12 out of 27 are girls. How many boy students are there
Found 2 solutions by ewatrrr, algebrahouse.com:
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
 

Hi,

In a school having 990 students 12 out of 27 are girls.

Let x represent the total amount of girls in the class

 12%2F27+=+x%2F990  |Cross Multiplying to solve

     x = 12*990/27

     x = 440, the number of girls.  550 boys  (990-440)



CHECKING our Answer***

 12/27 = 4/9 = 440/990 = 44/99 = 4/9

Answer by algebrahouse.com(1659) About Me  (Show Source):
You can put this solution on YOUR website!
If 12 out of 27 are girls,
then 15 out of 27 are boys.
There are 990 total.

15 boys / 27 total = x boys / 990 total {set up a proportion}
27x = 15(990) {cross-multiplied}
27x = 14,850 {multiplied 15 by 990}
x = 550

there are 550 boys

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