9/3 = x/7 what is x and where did you find your answer ​

How do i do this activity, is appreciated

Sawsan recorded the favorite sport of students at her school. she surveyed 200 students. how many students chose tennis?

The first week samantha learned to read braille, she could read 10 words per minute. in the second week she increased her speed by 20%. in the third week she increased her speed again by another 25%. how many words could she read per minute by the third week? hurry and tell me!