book Maths Puzzle Numerical Ability

how do u work out a pecentage of a number such as 5% of 80 or 25& of 100
i already know the easy ones like 50& and 25% but what are the other ones?

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book Other Question

3 over 7 x = 15

solve for x
The Cape Cod Canal is eleven miles long. A passenger boat goes from here to Boston, via the canal and ocean, in 15 1/3 hrs., while a freighter makes the same trip in 30 hrs. On the