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Posted on Jan 02, 2017
The best way to solve this is to develop one or more equations and then solve for the unknown numbers.
I solved this problem twice using different sets of equations to make sure I was right, and here is what I found:
1) I used the equations x + y = 623, and x = (2/3)y. In these equations, x is the number of girls and y is the number of boys.
Substituting the second equation into the first, I get (2/3)y + y = 623.
Adding the left side together I get : (5/3)y = 623.
Dividing both sides by (5/3) I get 373.8.
This means that x (the number of girls) is 249.2.
2) For the second attempt, I developed the equation: 2x+3x=623. Here 2x is the number of girls, and 3x is the number of boys.
Adding the left side I get: 5x = 623.
Dividing both sides by 5 I get: x = 124.6.
This means that the number of girls (2x) is 249.2. Just like in the first method.
But since you can't have a 1/5 of a girl, the answer must be 249 girls.
Posted on Nov 19, 2009
If there are 25 boy in a class of 40 pupils, there are 40 - 25 = 15 girls. The ratio of boys to girls hence is 25:15, or as reduced fraction 5:3 = 1.6666...
Posted on Jan 16, 2011
If there are 40 total students, and 25 are boys, then (40-25) of them are girls, or 15.
That means the ratio of boys to girls is 25 to 15, or 25/15
This can be simplified by dividing by 5, so the ratio is 5/3
Posted on Jan 16, 2011
SOURCE: If a high school graduating
435 - 151 = 284
This subtracts the inequality between girls and boys.
Then the rest are split in half equally.
284 / 2 = 141
Hope this helps. Got any more ;)
Posted on Feb 16, 2011
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Genette God is gracious. The feminine form of John. Also see Janelle, Janet, Janice, Janine, Jean, Joan, Joanne, Shane, Sim. Geneva After the city in Switzerland. Also see Genevieve. Genevieve Old French A woman of the people.
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