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45 people, 26 people take part in math and 22 people take part in composition. 12 people both participate. How many people don't take part in either?
There are two questions about this topic: how many people are involved in both? How many people didn't attend?

If the first one is required, the number of participants must be subtracted from the total number of participants in mathematics and Chinese.

(22+ 12)-26=8 (person)

Finding the second one is very simple, that is, 45 people MINUS the number of participants.

45-26= 19 (person)

A: Eight people participated in both events, and 19 people did not participate in both events.

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