Question

The average weight of six girls is 36kg. Find the weight of the six girl if the weight of 5 girls are 32kg, 33kg, 39kg, 40kg.

Answer 1

Here,

$\frac{32 + 33 + 39 + 40 + x}{6} = 36 \\ \\ \frac{144 + x}{6} = 36 \\ \\ 144 + x = 216 \\ x = 216 - 144 \\ x = 72 \: kg$