In a school survey, it was found that for every 4 girls there were 5 boys. Fill in the following table. Girls 4 8 Boys 15 20 Total 45 Now answer these questions: What is the ratio of girls to boys?

Given that, For every 4 girls there were 5 boys. So, when the number of girls = 4 . Then, number of boys = 5 . Now, we know that for every 4 x girls, there are 5 x boys. So, according to given data, 4 x = 8 ⇒ x = 8 4 = 2 So, number of boys = 5 × 2 = 10 Similarly, we can write that, Number of boys = 5 x . So, according to given data, 5 x = 15 ⇒ x = 15 5 = 3 Thus, number of girls = 4 × 3 = 12 . Again from the given data, 5 x = 20 ⇒ x = 20 5 = 4 Therefore, number of girls = 4 × 4 = 16 . Also, it is given that total students = 45 . Sum of parts = Total students So, 4 x + 5 x = 45 ⇒ 9 x = 45 ⇒ x = 45 9 = 5 So, number of girls = 4 × 5 = 20 . And, number of boys = 5 × 5 = 25 . Thus, the complete table is Girls 4 8 12 16 20 Boys 5 10 15 20 25 Total 9 18 27 36 45 Here, total number of girls = 4 + 8 + 12 + 16 + 20 = 60 . And, total number of boys = 5 + 10 + 15 + 20 + 25 = 75 . Thus, ratio of girls to boys is = 60 : 75 = 12 : 15 = 4 : 5 Hence, the answer is 4 : 5 .

In a school survey, it was found that for every 4 girls there were 5 boys. Fill in the following table. Girls 4 8 Boys 15 20 Total 45 Now answer these questions: In a class of 27 children, how many would be girls?

Given that, For every 4 girls there were 5 boys. So, when the number of girls = 4 . Then, number of boys = 5 . Now, we know that for every 4 x girls, there are 5 x boys. So, according to given data, 4 x = 8 ⇒ x = 8 4 = 2 So, number of boys = 5 × 2 = 10 Similarly, we can write that, Number of boys = 5 x . So, according to given data, 5 x = 15 ⇒ x = 15 5 = 3 Thus, number of girls = 4 × 3 = 12 . Again from the given data, 5 x = 20 ⇒ x = 20 5 = 4 Therefore, number of girls = 4 × 4 = 16 . Also, it is given that total students = 45 . Sum of parts = Total students So, 4 x + 5 x = 45 ⇒ 9 x = 45 ⇒ x = 45 9 = 5 So, number of girls = 4 × 5 = 20 . And, number of boys = 5 × 5 = 25 . Thus, the complete table is Girls 4 8 12 16 20 Boys 5 10 15 20 25 Total 9 18 27 36 45 So, from the table it is clear that, if the number of children is 27 , then the number of girls will be 12 .

In a school survey, it was found that for every 4 girls there were 5 boys. Fill in the following table. Girls 4 8 Boys 15 20 Total 45 Now answer these questions: There are 54 children in a class. How many are boys?

Given that, For every 4 girls there were 5 boys. So, when the number of girls = 4 . Then, number of boys = 5 . Now, we know that for every 4 x girls, there are 5 x boys. So, according to given data, 4 x = 8 ⇒ x = 8 4 = 2 So, number of boys = 5 × 2 = 10 Similarly, we can write that, Number of boys = 5 x . So, according to given data, 5 x = 15 ⇒ x = 15 5 = 3 Thus, number of girls = 4 × 3 = 12 . Again from the given data, 5 x = 20 ⇒ x = 20 5 = 4 Therefore, number of girls = 4 × 4 = 16 . Also, it is given that total students = 45 . Sum of parts = Total students So, 4 x + 5 x = 45 ⇒ 9 x = 45 ⇒ x = 45 9 = 5 So, number of girls = 4 × 5 = 20 . And, number of boys = 5 × 5 = 25 . Thus, the complete table is Girls 4 8 12 16 20 Boys 5 10 15 20 25 Total 9 18 27 36 45 Here, given that there are total number of children = 54 . Sum of the parts of boys and girls = Total number of students Thus, 5 x + 4 x = 54 .....[ x is the common ratio] ⇒ 9 x = 54 ⇒ x = 54 9 = 6 Thus, the number of boys is 5 × 6 = 30 .

In a school survey, it was found that for every 4 girls there were 5 boys. Fill in the following table. Girls 4 8 Boys 15 20 Total 45 Now answer these questions: If 20 girls join in a year. How many boys would join?

Given that, For every 4 girls there were 5 boys. So, when the number of girls = 4 . Then, number of boys = 5 . Now, we know that for every 4 x girls, there are 5 x boys. So, according to given data, 4 x = 8 ⇒ x = 8 4 = 2 So, number of boys = 5 × 2 = 10 Similarly, we can write that, Number of boys = 5 x . So, according to given data, 5 x = 15 ⇒ x = 15 5 = 3 Thus, number of girls = 4 × 3 = 12 . Again from the given data, 5 x = 20 ⇒ x = 20 5 = 4 Therefore, number of girls = 4 × 4 = 16 . Also, it is given that total students = 45 . Sum of parts = Total students So, 4 x + 5 x = 45 ⇒ 9 x = 45 ⇒ x = 45 9 = 5 So, number of girls = 4 × 5 = 20 . And, number of boys = 5 × 5 = 25 . Thus, the complete table is Girls 4 8 12 16 20 Boys 5 10 15 20 25 Total 9 18 27 36 45 Here, given that there are total number of girls = 20 . Now, we know that for every 4 x girls, there are 5 x boys. Thus, 4 x = 20 .....[ x is the common ratio] ⇒ x = 20 4 ⇒ x = 5 Thus, the number of boys would join = 5 × 5 = 25 .