Three investors own a company. One partner owns 1 fourth of the company, while the second partner owns 2 fifths of the company. How much does the third partner own?

The three partners’ shares must add up to 1 whole company. The first two own 1/4 + 2/5 = 5/20 + 8/20 = 13/20. The third partner therefore owns 1 − 13/20 = 7/20, which is choice B, “7 over 20.”

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