5:7 (or 5/7) is equivalent to 10:14 (10/14) and 15:21 (15/21).
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It is 3 to 5 in its simplest form
yes
Yes, those two ratios are equal!
Ratios can be written either like this 4/5 or 4:5 both mean 4 out of 5
50/90, 500/900 and 55/99 are three ratios equivalent to 5/9.