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C. Study the following ratios and determine which are proportions and those are not:
1. 6:10 = 42:70
2. 4:9 = 24:54
3. 7:15 = 8:32
4. 11:20 = 15:19
5. 5:9 = 40:72​


Sagot :

Answer:

1. Proportion

2. Proportion

3. Not proportion

4. Not proportion

5. Proportion

Step-by-step explanation:

To know if the given ratios are proportion,

multiple the means and the extremes. If the answers are equal then they are proportion otherwise they are not.

To know what means and extremes are,

a:b=c:d

b & c are the means and a & d are the extremes.

If bc=ad, it is proportion.

If bc≠ad, it is not proportion.