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Earn +20 ptsQ: Do 3 over 5 and 12 over 20 from a proportion?
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What fraction is equivalent to 20 over 12?
20/12 = 5/3
If you buy 3 books for five dollars how much would twelve books cost?
3*4 is 12 so $5 * 4 is $20. It's like a proportion. So, 12 books would cost $20.
Simplify 12 over 20?
3/5
What fraction is equal to 12 over 20?
12/20=6/10=3/5 Do you see the pattern?
How can you tell if a proportion is true?
If you cross-multiply and you obtain an equality, then the proportion is true. Example: 2/3 = 20/30 ? cross-multiply; 2 x 30 = 3 x 20 ? 60 = 60 Since we have an equality, the proportion is true.
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