SOLUTION: Benito has 20 small balls of different colours: yellow, green, blue and black. 17 of the balls are not green, 5 are black, 12 are not yellow. How many blue balls does Benito have?

Algebra ->  Permutations -> SOLUTION: Benito has 20 small balls of different colours: yellow, green, blue and black. 17 of the balls are not green, 5 are black, 12 are not yellow. How many blue balls does Benito have?       Log On


   

Question 302061: Benito has 20 small balls of different colours: yellow, green, blue and black. 17 of the balls are not green, 5 are black, 12 are not yellow. How many blue balls does Benito have?
A) 3 B) 4 C) 5 D) 8 E) 15
Answer by scott8148(6628) About Me  (Show Source):
You can put this solution on YOUR website!
"17 of the balls are not green" ___ so 3 are green

"12 are not yellow" ___ so 8 are yellow

"5 are black"

so 16 are NOT blue