Question

Card in a pack are black and red in a ratio black:red=2:5 what fraction of the cards are red a)7/10 b)2/5 c)5/7 d)2/7

please help me to why is 5/7?​

Answer 1

c. 5 / 7

Explanation:

Ratio of Black to Red of 2 : 5 means in a total of 7 cards, you will get 2 Black and 5 Red cards.

So, fraction of Red cards will be total number of possible Red cards divided by total number of all cards

1.e 5 / 7