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18/15 = 6/5 = 1.2
I am assuming that you mean 15 meters by 18 meters. 15:18 = 5:6
5 over 6. However, this is a fraction, not a ratio
both 15 and 18 can be divided exactly by 3 so the answer is 5/6
15:18 It can also be written as a fraction 15/18 Because there are 15 girls and 18 boys