A caricature artist works 5 days a week dress 18 portraits per day on average in charge of $16 a portrait if he lowered his price of $12 a portrait by how many portraits per day on average most he increases production to make the same amount of money per five day work week

5 days a week, 18 portraits per day, $ 16 per portrait = (5 * 18 * 16) = $ 1440

5 days a week, x portraits, $ 12 per portrait = $ 1440

(5 * x * 12) = 1440

60x = 1440

x = 1440/60

x = 24 ... he would need to do an average of 24 per day

so he would have to increase his portraits by (24 - 18) = 6 per day <=