Iron is much denser than a feather. yet, a particular sample of feathers weighs more than a sample of iron. explain how this is possible.

Answer is: density doesn't affect on weigh.
Density of a substance is its mass per unit volume, density is defined as mass divided by volume (d = m/V).
Weight is force on the object due to gravity. Weight is product of the mass of substance and the magnitude of the local gravitational acceleration (W = mg). Feather can have larger mass and also weight.

The answer is !