Ratio and Proportion Practice Test 3

Let number of boys and girls be 3x and 2x respectively. Then total number of students = 3x + 2x = 5x
Number of studetns who do not getting scholarships $=\frac{80}{100}\times 3\mathit{x}+\frac{75}{100}\times 2\mathit{x}$ $=\frac{12}{5}\mathit{x}+\frac{3}{2}\mathit{x}=\frac{39}{10}\mathit{x}$
Hence, required percentage $=\frac{39\mathit{x}}{10\times 5\mathit{x}}\times 100=78\%$