There are 40 students in a classroom, 9/20 of students are boys and 4/5 of students are right-handed. What is the maximum number of right-handed boys possible?

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What this question tests

Your ability to convert between fractions, ratios, and decimals and to reason proportionally.

Cross-multiplying incorrectly or mixing up the ratio parts — a part:part ratio is not a fraction of the whole.