Question

if the ratio of boys and girls in a class is 7:5 which of the following cannot be the total number of students in the class 1. 36 2. 50 3. 60 4. 120

Answer 1

2. 50 is the answer, as fifty does not come in the table of 12 which is the sum of the given ratio.

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Answer 2

Answer: 50

Step-by-step explanation:

Let us take:

No. Of girls = 5x

No. Of boys = 7x

We shall try each part.

1. ATQ,

5x+7x=36

12x=36

x=36÷12

x=3

5x=15 [girls]

7x=21 [boys]

2. 5x + 7x= 50

12x =50

x = 50÷12

x=4.16

5x = 20.8 girls

7x = 29.12 boys

3. 5x + 7x = 60

12x = 60

x = 5

5x = 25 girls

7x = 35 boys.

4. 5x + 7y = 120

12x = 120

x = 10

5x = 50 girls

7x = 70 boys

Let's verify

1. Natural no.

2. Integer

3. Natural no.

4.Natural no.

Since (2,:50) is an integer it is the right answer( because counting of students can't be in decimals, it is always a natural no.)

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