Math
posted by Tom .
A bag of 12 white marbles and 1/3 red marbles and 2/5 blue marbles what is the total marbles in the bag?

well, the fraction of white is 1redblue
= 12/51/3=15/156/15  5/15= (1511)/15=4/15
but 4/15 N=12 or
N= 12*15/4=45 marbles