He has 10 pounds of apples and the recipe asks for 8 ounces for each cup. The first step to calculate how many cups he can make is to convert the amount he has from pounds to ounces, we do that by multiplying by 16 as shown below:
Since he has 160 ounces and each cup requires 8 ounces, we need to divide the number of ounces he has by 8 to find the number of cups he can make.
He can make 20 cups of the applesauce.