The number of students who play Hockey is how many more than the number of students who play Tennis, if the total number of students is 2000?
Answer: C
Percentage for Hockey = 20%.
Percentage for Tennis = 10%.
The difference in percentage is 20% - 10% = 10%.
The difference in the number of students = 10% of 2000
= 0.10 × 2000 = 200.