Question

A bag contains both black and red marbles. The ratio of black to red marbles is 3:4.

Answer 1

The total number of marbles in the bag is 7, since 3+4=7. There are 3:4 black marbles, so 3/7 of the bag is black marbles, which can be written as 3:7.

4/7 of the bag is red marbles, which can be written as 4:7