David typed 210 words in 30 minutes. What is her rate of typing?

210 words ... 30 minutes

x words ... 1 minute

If you would like to know how many words can David type in 1 minute, you can calculate this using the following steps:

x * 30 = 210 * 1 / 30

x = 210 / 30

x = 7 words

Result: David can type 7 words in 1 minute.