Question

A bag contains 40 marbles, some white some red. The ratio of white marblesto red ones is 1:7. How many red marbles are there?

Answer 1

The ratio is 1:7. This means there are 8 total parts. Start by dividing 40 by 8. This equals 5. Each part equals five, so the white marbles are 5. However, question asks for the number of RED. 7 of the 8 parts are red. 7*5 is 35 so there are 35 red marbles.