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.
12
100
10 Green marbles, 13 Blue marbles.
25
The British Museum currently has ownership of the marbles, but they belong to the world.
12 blue marbles
24 red marbles
Six marbles
no