Question

7 In class loa, there are 20 boys and 15 girls In 10 Bither war 15 beys and isgirls.one student is to be selected participating the mathemates tais from each class a) what is the probability of being boys ? 5) What is the probability of both being girls? c) What is the probability of one boy and one girly both​

Answer 1

Answer:

SOLUTION:

given number of girls = 20

boys = 15

therefore, the total number of students in class 20+15=35

the ratio of no. of girls to the number of boys= no. of girls/no. of boys

= \frac{20}{15}=\ \frac{20\div5}{20\div5}=\frac{4}{5\ }=4:5

[HCF of 20, 15 = 5]

ii) ratio of the number of girls to the total no. of students in the class = number\ of\ \frac{gitls}{boys}=\ \frac{20}{35}=\frac{20\div5}{35\div5}=\frac{4}{5}=4:7

[HCF of 20, 35 = 5)