millerjason92 millerjason92
  • 07-04-2020
  • Mathematics
contestada

A bag contains blue marbles and red marbles, 31 in total. The number of blue marbles is 9 less than 3 times the number of red marbles. How many blue marbles are there?

Respuesta :

fuei fuei
  • 19-04-2020

Answer:21 blue marbles

Step-by-step explanation:

(3r-9)+r=31

4r-9=31

4r=40

r=10 Red marbles

B+

b+(10)=31

b=21 blue marbles

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