In a bag contain blue,red and green marbles,all but 15 are blue,all but 13 are red,all but 12 are green.How many are red
a)13 b)7 c)20
d)25

• given that r+g=15
  g+b=13
  r+b=12
  by solving gives r-=7
• 11 years agoHelpfull: Yes(1) No(0)