Question

In the last several weeks, 18 days saw rain and 29 days saw high winds. in the same time period 7 days saw both rain and high winds. How many days saw either rain or high winds

Answer 1

40 days saw either rain or high winds

Explanation:

We solve this question using Venn sets.

I am going to say that:

Set A: Rain

Set B: High winds.

18 days saw rain

This means that
`A = 18`

29 days saw high winds

This means that
`B = 29`

7 days saw both rain and high winds.

This means that
`A \cap B = 7`

How many days saw either rain or high winds?

This is

`A \cup B = A + B - A \cap B`

Sp

`A \cup B = 18 + 29 - 7 = 40`

40 days saw either rain or high winds