book Maths Puzzle Numerical Ability

William is 1/6 as old as his father but 5 years older than his sister, Mary. If the sum of all their ages is 51, how old is William?

(not from a text) Thank You for your help.

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book Other Question

What is 8,000,000,000,000 and also 104,300,000,000 written in scientific notation? My teacher made up a worksheet for us and I am having trouble with these.

Thanks so much for your help
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