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'More or Less?' printed from http://nrich.maths.org/
In each question there will be some way of relating the quantities
referred to. You will need to think what equations from science to
Once you have the equations, what quantities don't you know? Could
you substitute sensible values for one of these?
Don't forget to use physical intuition. For example, an apple
floats in water. What does that tell you about its density?