There are four types of cards in a game. Each card has a black circle or a white circle or a black triangle or a white triangle.
О O
number of cards
with a black shape
number of cards
with a white shape
3:8
number of cards
with a circle
number of cards
with a triangle
2:5
Express the total number of cards with a black shape as a fraction of the total number of
cards with a triangle.