Q: Do 3 over 5 and 12 over 20 from a proportion?

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20/12 = 5/3

3*4 is 12 so $5 * 4 is $20. It's like a proportion. So, 12 books would cost $20.

3/5

12/20=6/10=3/5 Do you see the pattern?

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.

Related questions

12/20 = 3/5

3/4 and 20/30 does not make a proportion. 20/30 = 2/3 3/4 does not equal 2/3 so it is not a proportion.

3/5 = 12/x Cross multiply: 3*x = 5*12 = 60 Divide both sides by 3: x = 20

Yes

12

20/12 = 5/3 = 12/3

3/5 - 3/4 = 12/20 - 15/20 = (12 - 15)/20 = -3/20

( 8 + 11/20 ) - ( 3 + 3/5 ) or 8 11/20 - 3 12/20 or 7 31/20 - 3 12/20 4 19/20 4 19/20 or 4 and 19 over 20

5/3

20/12 = 5/3

is: 12/20 = 3/5 simplified

The simplified fraction of 12 over 20 is 3/5