a) 69%
b) 72%
c) 74%
d) 75%
Answer: b
Explanation:
$$\eqalign{
& {\text{Sum}}\,{\text{of}}\,{\text{pass}}\,{\text{student}}\,{\text{}}\,{\text{first,}}\,{\text{second}}\,{\text{and}}\,{\text{third}}\,{\text{class}}, \cr
& = \left( {70\% \,{\text{of}}\,10} \right) + \left( {60\% \,{\text{of}}\,15} \right) + \left( {80\% \,{\text{of}}\,25} \right) \cr
& = 7 + 9 + 20 = 36 \cr
& {\text{Total}}\,{\text{students}}\,{\text{appeared}}, \cr
& = 10 + 15 + 25 = 50 \cr
& {\text{Pass}}\,{\text{average}}, \cr
& = 36 \times \frac{{100}}{{50}} = 72\% \cr} $$
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