Question $8(20$ points$)$

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A group of young adults who were asked which issues would be important during the next decade gave the following answers:

$46$ believed that nuclear war, terrorism, and environmental concerns would be important.

$90$ believed that nuclear war would be important.

$62$ believed that nuclear war and terrorism would be important.

$59$ believed that nuclear war and the environment would be important.

$67$ believed that the environment and terrorism would be important.

$96$ believed that terrorism would be important.

$27$ believed that only the environment would be a serious issue.

$11$ believed that none of the issues would be important.

a$.$ How many people were surveyed?

b$.$ How many people believe the environment would be an important issue?

c$.$ How many people believed only terrorism would be an important issue?