Can anyone help with a quick ratio problem?
A bag contains yellow, green, blue, and white marbles in the ratio 4:2:3:7. If the bag contains 240 marbles, then how many blue marbles are there?
4+2+3+7=16
Divide 240/16 to get 15*4 yellow, 15*2 green, 15*3 blue, and 15*7 white.
Blue is what we are looking for, so the answer is 15*3=45.
+1347 
