It is simply 18:31.
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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.
31/25 is in its simplest form.
248/160 = 31/20.
The ratio then will be 18 to 10
The ratio of boys to girls is 18:28. Simplified it is 9:14.14/9