sara bought both german chocolate and swiss chocolate for some cakes she was baking . the swiss chocolate cost $ 3.6 per pound , and german chocolate cost $ 3 per pound . if the total the she spent on chocolate was $ 36 and both types of chocolate were purchased in whole number of pounds , how many total pounds of chocolate she purchased ?
"if there were all the expensive ones , 3.6 . . . there would be 36 / 3.6 or 10 of them but since 3 $ ones are also there , answer has to be > 10 . . . . . if all were 3 $ ones , there will be 36 / 3 ans e"
divide(36, divide(add(3.6, 3), const_2))