Question

A bag contains 144 marbles. Some are red and the rest are black.There are 11 red marbles for every black marble.How many red marbles are in the bag?

Answer 1

There are 132 red marbles and 12 black marbles

Work:

I made a ratio of 11:1 and multiplied both sides by 12 which gave me 132:12

132+12=144