• question_answer 1) 72% of 25 students are good at mathematics. How many students are not good at it? A)  8                                B)  10C)  12                             D)  7

(d): 72% are good $\Rightarrow Not\text{ }good=28%$ Now 28% of $25=\frac{28}{\cancel{100}}\times \cancel{25}=7$