Question

Ciara has a bag of 60 colored marbles. There are purple, green, and red marbles,. She empties the bag, sorts the marbles, and counts 11 purple marbles and 20 green marbles. She wants to write a ratio of the number of purple marbles to the number of red marbles. How can she find the number of red marbles without counting them?

Answer 1

`Red = 29`

Explanation:

Given

`Total = 60`

`Purple = 11`

`Green = 20`

Required

Number of red marbles, without counting

To do this, we simply subtract the sum of the purple and red marbled from the total marbles.

So, we have:

`Red = Total - (Purple + Green)`

`Red = 60 - (11 + 20)`

`Red = 60 - 31`

`Red = 29`