The ratio 15 to 10 (also written as 15:10) can be simplified down to 3 to 2 (otherwise written as 3:2).
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The ratio of 10 to 5 cannot equal 7.5: EVER!
15
the ratio between 63 and 70 is 9:10, because if u divide 63/7 equals 9 and 70/7 equals 10.
If y equals 5x-15 and x equals 1 then the value of y comes out to be -10. So y equals 5x-15 is -10.