If none of the students are ambidextrous, what percentage of the 20 students in Mr. Henderson's class are left-handed?

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If none of the students are ambidextrous, what percentage of the 20 students in Mr. Henderson's class are left-handed?

(1) Of the 12 girls in the class, 25% are left-handed.
(2) 5 of the boys in the class are right-handed.

Answer: C

Source: Manhattan GMAT
Source: — Problem Solving |