book Maths Puzzle Numerical Ability

I need to know how to find 68% of 50 Is there any way you can give me the formula or a way to find the % of whole numbers like that?

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book Other Question

Solve each system by the addition method
x + y = 13
22x + 36y = 356


Solve each system by the addition method. Determine whether the equations are independent, dependent, or
When you are doing absolute value and the problem is a negative when you solve it does it stay negative or do u ignore the negative sign? Thnx.