Martin said:
I'll give you a hand on the first one. Do you know the dimensions of A4 paper? If no, google them. I read somewhere most paper is 1mm thick. Check post count, mulitply by thickness, calculate height. Prerequisites: the ability to multiply and to divide.
A six year old is playing at the beach. He has a bucket full of water, which he dumps back into the sea. By how much does the sea level rise because of this?
(Sorry for the poor English, but I don't use semi-formal speak in a foreign language that often)
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