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People sometimes say " A pint is a pound the world around " meaning that
in the entire world a pint of water weights about one pound.
It is interesting that there are different pints: US, UK and imperial
as the liquid volume measurement units, and they all are different,
but I will not consider it here. These words above relate to the US pint.
Other people say " A pint is NOT a pound the world around ", meaning that
a pint of water (the US pint) weights not precisely a pound.
Both sides are right, each in its own way.
But let's return to our problem. They want you determine, what is heavier - a pint of water or a pound of sand.
Now, in order for my story was not too long, I asked GOOGLE " what is the weight of one pint of water ?"
It responded me: one pint of water weights about 1.04318 pounds.
So, the answer to the problem's question is: one pint of water is heavier than one pound of sand.
Which water ? - Water may be different: pure, saline, dirty water.
But of course, both the question and the answer relate to chemically and
physically pure water in its liquid state at the room temperature.