9 : 15 = 3 : 5
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As for example 15 and 9 can be reduced to a ratio of 5 and 3
144:81 can be reduced to a 16:9 ratio.
729/8
The average of -9 and 15 is +3 .
the ratio between 63 and 70 is 9:10, because if u divide 63/7 equals 9 and 70/7 equals 10.