Mark and James need a total of 14 dice that are 12 sided to play their game. Mark has a bag of 10 dice and 60% of them are 12 sided. James has a bag of 8 dice and 75% of them are 12 sided. How many dice will the boys need to buy to play their game?
Thoughts? Step-by-step reasoning:
Mark has 60% 12 sided dice, so 60 / 100 * 10 dice in his bag = 6 12 sided dice. James has 75% 12 sided dice, so 75 / 100 * 8 dice in his bag = 6 12 sided dice. They will need to purchase 14 dice - 6 dice - 6 dice = 2 dice.
Thus, the answer is 2.