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Students are donating money to a charity fund that helps less privileged kids. The number of $2, $5 and $10-notes donated are in the ratio of 9:2:5. 4/9 of the $2-notes and 10 $5-notes are taken out. The remaining notes are worth $300. How many $10-notes are there?

 May 8, 2022
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The ratio can be expressed as 9x:2x:5x. we get the equation:

\(9x*2+2x*5+5x*10-9*\frac{4}{9}x*2-50=300\)

Simplifying it we get:

 \(18x+10x+50x-8x=350\)

\(70x=350\)

Soving it we get x=5. This means that there are \(5*5=\boxed{25}\) $10 notescool

 May 8, 2022

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