Question

In a class, 4/7th of the students are boys. The students of the class voted to choose their class leader. 3/4th of the boys voted for a particular candidate while 15 girls did not vote for him. If 57 students voted for that candidate, find the strength of the class.​

Answer 1

Step-by-step explanation:

I will tell you later mark me brainliest .

Answer 2

Answer:

84

Step-by-step explanation:

Let strength of the class be 'x'

4/7 th of the students are boys

No. of boys in the class = 4/7th of x

=4x/7

So, No. of girls in the class = x - 4x/7

= 3x/7

$no \: of \: the \: boys \: voted = \frac{3}{4} of \frac{4x}{7}$

$= \frac{3}{4} \times \frac{4x}{7}$

$= \frac{3x}{7}$

$again \: no \: of \: girls \: voted = \frac{3x}{7} - 15$

A/Q

$\frac{3x}{7} + \frac{3x}{7} - 15 = 57$

$= > \frac{3x}{7} + \frac{3x}{7} = 57 + 15$

$= > \frac{3x + 3x}{7} = 72$

$= > \frac{6x}{7} = 72$

$= > 6x = 72 \times 7$

$= > x = \frac{72 \times 7}{6}$

$= > x = 12 \times 7$

$so \: \: x = 84$

So, the strength of the class = 84