book Maths Puzzle Numerical Ability

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

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We are doing these questions in math class and i am so lost especially that its a spanish class and my teacher only speaks spanish so i don't know how to ask him because i don't sp 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?