A grocer buys cashews for $9 per kilogram and peanuts for $4.50 per kilogram. He wants to sell the nuts individually, and he also makes 12 kilograms of a peanut-cashew mix which costs him $6 per kilogram. a How many kilograms of each nut does the grocer require to make the mix?

b How many grams of each nut is in a 1 kg serve of the mix?

c Over a one week period, the grocer sells 18 kg of nuts, which cost him $145.80. Find the total weight of each nut sold during the week.

plz awsner
I will give 10 points for the best awnser​