Question

24. In a centre at BSC Academy, among 500 students,
the average age of boys is 24 years and that of
girls is 21 years. If the average age of the students
at the centre is 22 years and 3 months find the
approximate number of girls at the BSC Academy
centre.
(a) 290 girls (b) 292 girls (c) 295 girls
(d) 288 girls (e) 293 girls​

Answer 1

Step-by-step explanation:

e=293

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Answer 2

Answer:

Total number of girls are 207.

Step-by-step explanation:

Average age of all students is 22 years and 3 months

Average age of boys is 24 years

Average age of girls is 21 years

Now,

Let number of boys be x

so, number of girls are (500-x)

$\frac{24 \times x + 21(500 - x)}{500} = 22 \frac{3}{12}$

By solving this equation we have

$x = 207$

So number of girls = (500-207)= 293