Question 342037
Problem has no solution as stated BECAUSE:
You start with 5*30=$150 worth of mixed nuts.
To which you want to ADD peanuts @ $1.50 & cashews @ $4.50 per pound. 
However you want to end up with 50 pounds costing $2.90 per pound.
50*2.90=$145.00 which is less than what you started with.