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

Each day a yourg person should sleep 8 hours plus 1/4 hour for each year the person is under 18 years of age. Write the equation relating hours of sleep y to age x, for 6 is less t solve for x: b-2x=3b-4x