A) 58
B) \[66\frac{2}{3}\]
C) 78
D) \[83\frac{1}{3}\]
Correct Answer: C
Solution :
Let the number of boys be 3x and that of girls be 2x. Number of boys who are not adults \[=\frac{3x\times 80}{100}=\frac{12x}{5}\] Number of girls who are not adults \[=\frac{2x\times 75}{100}=\frac{3x}{2}\] Number of students who are not adults \[=\frac{12x}{5}+\frac{3x}{2}=\frac{24x+15x}{10}\] \[=\frac{39x}{10}\] \[=\frac{10}{5x}\times 100=78\]You need to login to perform this action.
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