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Re: On Monday, a class has 8 girls and 20 boys. On Tuesday, a ce [#permalink]
1
Hello, I'm confused with the phrase :
a certain number of girls joined the class just as twice that number of boys left the class

I translate it
for girls = 2x
because the girls' number equals twice that of boys. May someone explain pls?
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Re: On Monday, a class has 8 girls and 20 boys. On Tuesday, a ce [#permalink]
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Look at the explanation provided by Brent just above. There is nothing to add to that.

it is so simple yet efficient and cristal clear.

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Re: On Monday, a class has 8 girls and 20 boys. On Tuesday, a ce [#permalink]
On Monday, a class has 8 girls and 20 boys. On Tuesday, a certain number of girls joined the
class just as twice that number of boys left the class, changing the ratio of girls to boys to 7 to 4.
How many boys left the class on Tuesday?
why we can't reduce the 8 girls and 20 boys in the ratio of 2:5 and solve?
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On Monday, a class has 8 girls and 20 boys. On Tuesday, a ce [#permalink]
2
Hey,

We are given whole no of boys and girls. So no need to reduce that to a ratio.
And even if you do it,

Let's say girls : boys = 2:5

A certain number of girls joined the class just as twice that number of boys left the class, changing the ratio of girls to boys to 7 to 4
The equation will be like this:

\(\frac{2x + y }{ 5x - 2y}\) = \(\frac{7}{4}\)

Now we will have to deal with \(2\) unknown \(x , y\) with one equation only. So not possible.

Just one thing sir, whatever given in the stem - do not make it more twisted. This one is very easy, just solve and move on.

Ask if something is unclear.

Regards,
R

Uhnil wrote:
On Monday, a class has 8 girls and 20 boys. On Tuesday, a certain number of girls joined the
class just as twice that number of boys left the class, changing the ratio of girls to boys to 7 to 4.
How many boys left the class on Tuesday?
why we can't reduce the 8 girls and 20 boys in the ratio of 2:5 and solve?
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Re: On Monday, a class has 8 girls and 20 boys. On Tuesday, a ce [#permalink]
The phrase of the question could be better than it is.
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Re: On Monday, a class has 8 girls and 20 boys. On Tuesday, a ce [#permalink]
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