The ratio of 18 and 15 is 18:15, but it can be reduced.
3 is the GCF of both numbers, so we can divide each by 3.
The ratio of 18:15 after dividing both numbers by 3 is 6:5.
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It is simply 18:31.
There is no fixed ratio.
The ratio is simply 24/15. That fraction (or ratio) can be simplified by dividing both numbers by their highest common factor.
It is 15/150 = 1/10.
15 ÷ 18 = 0.8333