Question
Average weight of 25 boys is 60 kg and average weight of
'n' girls is 45 kg. If average weight of all the boys and girls is 52.5 kg, then find the value of (n - 5).Solution
Sum of weight of all the boys = 25 × 60 = 1500 kg Sum of weight of all the girls = 45n kg (1500 + 45n) ÷ (n + 25) = 52.5 Or, 1500 + 45n = 52.5n + 1312.5 Or, 7.5n = 187.5 Or, 'n' = 25 Required value = 25 - 5 = 20
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