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A bag contains blue marbles and red marbles, 107 in total. The number of blue marbles is 7 more than 4 times the number of red marbles. How many blue marbles are there?

 Mar 2, 2020
 #1
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Let  the  number of red  marbles  = R

Then the number of blue marbles  =  4R + 7

 

So

 

R  + ( 4R + 7) =   107    simplify

 

5R  + 7  = 107     subtract  7 from  both sides

 

5R  = 100   divide  both sides  by  5

 

R =   20  = red marbles

 

4 (20) + 7 =   87   = blue marbles

 

 

cool cool cool

 Mar 2, 2020

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