Question

Marshall bought 32 ounces of mixed nuts, which are estimated to be 30% peanuts. Which expression can be used to find the percentage of peanut concentration of the final mix if he adds x ounces of peanuts?

Answer 1

Initial peanuts = 30% of 32 = 0.30·32 = 9.6 oz. After adding x oz, peanuts = 9.6 + x and total weight = 32 + x.

Percentage of peanuts = 100·(9.6 + x)/(32 + x) percent (or simply (9.6 + x)/(32 + x) as a decimal).