The probability of selecting a yellow marble is #of yellow marbles/total # of marbles= 6/30 or .2 or 20%
If there are 300 marbles in the bag, a good estimate for the total number of red marbles in the bag is 90.
9/30=.3 = the percentage of red marbles
.3(300) = 90
I KILOGRAM IN GRAMS IS 1,000 grams, SO 7.4 TIMES 1000 IS 7,400
Thank you for letting me help :)