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

me to why is 5/7?

c. 5 / 7

Step-by-step 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

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step-by-step explanation:

you didn't post any answer choices, so its not 100% clear what your teacher is looking for

however, log(15/7) is equivalent to log(15) - log(7)

i'm using the rule log(x/y) = log(x) - log(y)