Help please?

What is the unit rate of, 75% high fiber chimp food to 25% high protein chimp food.

If the average of x,y and z is 15 what is their sum

You’re ordering more thread for blue jeans co. you usually purchase from ted’s threads, which sells 12 thread spools for $27. you recently received a notice from wade's wares that says you can buy thread from them for $2.30 each for the first 2 dozen and $2 a spool thereafter. you need to order 5 dozen spools. what percentage can you save by going with wade’s wares?