Question 276047
24/16=3/2 
so multiply each ingredient by 3/2
3/2*2/3=1 cup of butter
3/2*5 ounces of chocolate 15/2=7.5 ounces of chocolate
1 1/2=3/2
3/2*3/2=9/4=2 1/4 cups of sugar
3/2*2=3 teaspoons of vanilla
3/2*2 eggs= three eggs
3/2*1= 3/2 cups of flour = 1 1/2 cups of flour