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November 12th, 2018, 10:35 PM   #1
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Red and Blue marbles

A box contains red and blue marbles. 30% of the marbles are red and 42 of the marbles are blue. How many marbles are there in the box?

My work:

Let Total = T

(3/10)T + 42 = T. So T = 60.


My question, is there a better way to do this without doing fractions?
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November 12th, 2018, 11:20 PM   #2
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30% are red so 70% are blue

42 are 70%

6 are 10%

60 are 100%

is that any better for you?
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November 13th, 2018, 04:06 PM   #3
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Quote:
Originally Posted by romsek View Post

is that any better for you?
I'll stick with they way how I did it, thank you
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