Total number of Marbles =3000. (From the statement 1)
In statement 2, the multiplying factor is 1/5, hence the probablity of
red, P(R)=1/5. and the number of red marbles is 3000*1/5=600.
In statement 3, P(W)=8/25, so there are probably 3000*8/25=960 while marbles.
In statement 4, P(Y)=16/75, so there are probably
3000*16/75=640 yellow marbles in the bag.