How many gms of 10% sulfer cream should be added to 10gm of 2% sulfur cream to get 7% sulfur creamâ€‹

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# How many gms of 10% sulfer cream should be added to 10gm of 2% sulfur cream to get 7% sulfur

How many gms of 10% sulfer cream should be added to 10gm of 2% sulfur cream to get 7% sulfur creamâ€‹