Discussion
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
Hockey is 20% and Tennis 10%, a gap of 10 percentage points.
\[ 0.10 \times 2000 = 200 \]
Working with the difference in percentages is quicker than computing 400 and 200 separately.
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