People can charge whatever they want for their wares. If someone is using a formula like 18 for 3, 30 for 5, then they do not know business. Just do no do business with them unless you really need to or unless you really feel like getting ripped off.
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3/5 of 30 = (3 * 30) / 5 = 90/5 = 18
Prime factorisation of 18 = 2*3*3 Prime factorisation of 30 = 2*3*5 Then 1/18 = 5*1/5*18 = 5*90 (using the prime factor of 30 that is not in 18) and 1/30 = 3*1/3*30 = 3*90 (using the extra prime factor of 18 that is not in 30) So 1/18 + 1/30 = 5/90 + 3/90 = 8/90 = 4/45
30/5/3 = 30 x 3/5 = 18
It is: 18/30 = 3/5 in its simplest form
18/30=3/5