
Elementary Math Fractions, Percentages, Word Problems, Equations, Inequations, Factorization, Expansion 
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November 12th, 2018, 09:35 PM  #1 
Member Joined: Sep 2018 From: Japan Posts: 35 Thanks: 2  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? 
November 12th, 2018, 10:20 PM  #2 
Senior Member Joined: Sep 2015 From: USA Posts: 2,430 Thanks: 1315 
30% are red so 70% are blue 42 are 70% 6 are 10% 60 are 100% is that any better for you? 
November 13th, 2018, 03:06 PM  #3 
Member Joined: Sep 2018 From: Japan Posts: 35 Thanks: 2  

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blue, marbles, red 
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