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The average height of a class of 30 students is 166 cm. The average height of the girls in the class is 158 cm and the average height of the boys is 170 cm. Find the number of boys in the class. | |
A. | 10 [Wrong Answer] |
B. | 20 [Correct Answer] |
C. | 18 [Wrong Answer] |
D. | 15 [Wrong Answer] |