RRB Assistant Loco Pilot and Technician Model Paper 7 with solutions

Question : 5 of 100

Marks: +1, -0

The average weight of a class of 15 boys and 10 girls is 38.4 kg. If the average weight of the boys is 40 kg, then what is the average weight of the girls?

36.5 kg
35 kg
36 kg
34.6 kg

Validate

Solution:

{\Total \weight \of \girls + \Total \weight \of \boys}/{\No. \of \boys + \No. \of \girls}

⇒ 38.4 =

{ 600 + 10 × x } /{ 15 + 10 }

⇒ 38.4 =

{ 600 + 10x } /{ 25 }

⇒ 38.4 × 25 = 600 + 10x
∴ x = 36 kg

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