1.

In a class of 55 students there are 34 girls.The average weight of these girls is 51 kg and average weight of the full class is 55.2 kg. What is the average weight of the boys of the class?1). 622). 59.43). 56.84). 60

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


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