The ratio of yellow marbles to green marbles is 7 yellow marbles to 2 green marbles. If there are 21 yellow marbles, how many green marbles are there?
+36915 y / g = 7/2 re-arrrange to
2 / 7 * y = g can you finish from here ?
+36915 y / g = 7/2 re-arrrange to
2 / 7 * y = g can you finish from here ?
