Ben has a collection of 812 stamps. He gives his brother 345 stamps. About how many stamps Ben have left?
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Algebra
Since the numbers are the same, you are allowed to add the exponents.
For this case we must find an expression to find 40% of 25. So, we make a rule of three:
25 -----------> 100%
x -------------> 40%
Where "x" represents the amount that determines 40% of 25.
40% of 25 is 10. And an expression to find it is:
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