Question

The Average mass of 50 pumpkin is 2,1kg. If one more pumpkin is added, the average mass is 2,2kg. What is the mass of the extra pumpkin?

Answer 1

$\frac{2.1*50+x}{51}=2.2.$

$105+x=112.2.$

$x=112.2-105=7.2kg.$