Question

31. एक संगीत विद्यालय में 70% विद्यार्थी लड़के हैं। यदि लड़कियों की संख्या 255 हो तो लड़कों की
संख्या ज्ञात करो?
(a)575
(b) 540
(c) 850
(d) 595​

Answer 1

Given:

70% of the students in a music school are boys.

The number of girls is 255

To find:

The number of boys

Solution:

Let "x" represents the total no. of students in the music school.

So, if 70% of the total students are boys

Then, No. of boys = $\frac{70x}{100} = 0.7x$

∴ No. of girls = $x - 0.7x = 0.3x$

Therefore, we can form an equation as:

$0.3x = 255$

$\implies x = \frac{255}{ 0.3}$

$\implies x = 850$ ← total students in the school

∴ No. of boys = 850 - 255 = 595

Thus, the number of boys in the music school is → option (d) → 595.

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