Question

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

Answer 1

$total mass=50×2.1=105$ kg

$let x$ be equal to weight of the added pumpkin.

$=(105+x)\div51=2.2$

$=\frac{(105+x)}{51}×51=2.2×51$

$105+x=112.2$

$x=112.2-105=7.2$

The mass of the extra pumpkin is 7.2 kilograms.