So if nick purchased 9 planks and they cost 3$ each then you could add 3 nine times or multiply 3x9 which is 27$ now the same with the plywood but i would be 10$ he spent on those now add 27 to 10 and you get 37$ so he spent 37$ all together
First you add up the red and black so see how many she has total. 45 + 60= 105 then if you need to find the probability of the red candies you put 45/ 105 then you can simplify it so it would be 8/21
