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215 - 30 = 185. So, 185 is 30 less than 215.
The number could be any of the following: * 12 * 24 * 48
The multiples of 4 that are less than 30 are 4, 8, 12, 16, 20, 24, 28. So the greatest multiple of 4 that is less than 30 is 28.
No, 3.0 is the same number as 3. 3 is less than 30.
The number that 30 is ten less than is 40. Half that is 20. So the question becomes "what number is as much more than 10 is less than 20". This is gobbledygook, but if I rephrase to say "what number is as much more than 10 than 10 is less than 20", then since10 is less than 20 by 10, I guess 20.