Recent studies have shown that both American and Spanish people have a lack on the solution of simple calculus problems. The famous PISA study has shown all these results and even went further on the study of Maths and Lecture abilities.
To know something else about American results this link may be great:
If you are specially interested on the Spanish case try to click in the following link which also provides some of the exercises which tested population. I bet you can solve most of them and be up to the average. It is written in Spanish but I hope you can deal with it. Good luck!
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