Question

In the class of 55 students, average age 5% of 34 girls. Average age 55.5% of full class .find the average age of boyi,?

Answer 1

Answer:

Let the average weight of the boys be x kg.

In a class of 55 students there are 34 girls.

So, no. of boys = 55 – 34 = 21

The average weight of these girls is 51 kg and average weight of the full class is 55.2 kgs.

So, we can write now,

(51 × 34) + (21 × x) = 55 × 55.2

⇒ 1734 + 21x = 3036

⇒ 21x = 1302

⇒ x = 62

∴ The average weight of the boys = 62 kg

Step-by-step explanation:

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