Answer:
Given, number of girls = 20 and number of boys = 15 \[\therefore \] Total number of students in the class \[=20+15=35\] Ratio of number of girls to the number of boys \[\text{=}\frac{\text{Number}\,\text{of}\,\text{girls}}{\text{Number}\,\text{of}\,\text{boys}}\text{=}\frac{\text{20}}{\text{15}}\] \[=\frac{20\div 5}{15\div 5}=\frac{4}{5}=4:3\] [\[\because \] HCF of 20 and 35 = 5] (b) Ratio of number of girls to the total number of students in the class \[\text{=}\frac{\text{Number}\,\text{of}\,\text{girls}}{\text{Total}\,\text{number}\,\text{of}\,\text{students}}\text{=}\frac{\text{20}}{\text{35}}\] \[=\frac{20\div 5}{35\div 5}=\frac{4}{7}=4:7\] [\[\because \] HCF of 20 and 35 = 5]
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