48 marbles
at least 39 blue marbles
12 blue marbles
Set up the problem as: y=number of yellow marbles & 4y=number of blue marbles. 40=y+4y or 40=5y or y=8. Therefore number of blue marbles is 4*8 = 32.
24
48 marbles
at least 39 blue marbles
There are at least 11 green marbles in the bag.
The probability of selecting 4 red marbles or 5 blue marbles depends on how many marbles there are altogether, and how many of the total number of marbles are red and how many are blue.
12
He will have 13 blue marbles and 10 green marbles.
100
10 ?
He has 10 green marbles.
10 Green marbles, 13 Blue marbles.
25
56 marbles