A bag has 2x+1 red marbles, 3x blue marbles, and x+2 green marbles. What is the probability of picking a red marble?

Answer 1

total = 2x+1 + 3x + x+2
= 6x + 3

prob red = (2x+1)/(6x+3)
= (2x+1)/(3(2x+1) )
= 1/3