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An international unit (IU) depends on the the substance and there is no general formula for conversion.
The larger number is 48, the smaller number is 22. 48 is twice the amount of 22 plus 4. If the smaller number is "x" then the larger number is 2x+4. We know that x+2x+4 =70 which ius the same as saying 3x+4 = 70 or 3x = 70-4 = 66 so x, the smaller number is 66/3 =22