since the ratio is 1:3, let's just say there are 4 parts to the punch
first, divide the 32cups by 4 parts: 32÷4=8
this means there are 8cups per part
the ratio 1:3 means orange got 1 part and water got 3 parts so 1 part×8cups=8cups
So, James punch required a total of 8 cups of orange concentrate.