The average weight of all the students of a class is 55 Kg. The ratio of the average weight of Boys and Girls is 5 : 4. If 40% of the students are boys and rest are girls. Find the average weight of boys.
Answer & explanation
Correct answer: option 2
Let the common ratio = R
ATQ,
⇒ \(\frac{5R\;- \;55}{55\;-\;4R}\) = \(\frac{3}{2}\)
⇒ 10R - 110 = 165 - 12R
⇒ 22R = 275
⇒ R = 12.5
⇒ Boys = 12.5 × 5 = 62.5