The sum of the ages of will and anna is 20. if will is 4 years older than anna, how old is he. then how old is anna

Will is 14 years old and Anna is 6 years old.

Explanation:

If both of them had the same exact age, both of them would be ten years old. If will was 4 years older, you would add 4 years to Will and subtract Anna's age by 4.

b.

developed countries have tended to improve the environment, while developing countries have tended to damage it.