How many grams of 2.5% hydrocortisone cream should be mixed with 5 % cream to make a 30g 10 % cream?

You can%26#039;t make a 10% hydrocortisone cream with any amounts of 2.5% and 5% cream. No matter how you mix them, the mixture will be between 2.5% and 5% hydrocortisone.