A bag contains yellow, green, blue, and white marbles. The ratio of yellow, green, blue, and white marbles is 1:2:3:4. If the bag contains 180 marbles, then how many blue marbles are there?
+36916 Blue is '3' out of 1 + 2 +3 +4 =10 or 3/10ths 3/10 * 180 = 54 blue marbles
