Label each nut with a variable, c = cashews, p = peanuts..... for a 10-pound mix, you will need c + p = 10 the price for 10-pounds would become 3.29 x 10 = 32.90
You will need an unknown amount of cashews at 5.60/lb and an unknown amount of peanuts at 2.30/lbs to get your full 10 pounds valued at 32.90 5.60c + 2.30p = 32.90
Now you 2 have a system of 2 equations and 2 unknowns c + p = 105.6c + 2.3p = 32.9utilize substitution to solve:p = 10-c 5.6 c + 2.3 (10-c) = 32.9 solve for c then substitute back into c + p = 10 to solve for P
On the first day he earned 5; second day he earns square of 5 ie. 25; third day is 3 times of the second day, so it's 25x3 = 75. Add these 3 days together to get the answer, which is 105 dollars.