math
posted by maymay .
There are 25 red, blue, yellow and
green marbles in a bag. Four of the marbles
are blue and the probability of selecting a blue
or green marble at random is 40%. Write
and solve an equation to determine the
number of green marbles in the bag

prob(blue or green) = (4 + G)/25 = 40/100
4+G = 25(40)/100 = 10
G = 6