exam Maths Puzzle Numerical Ability

i dont understand how to do this. i was wondering if there is an easier way to try and figure out these problems, or a step-by-step guide on how to do each problem. Thank you!

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exam Other Question

I am having trouble with this question it asks:
The sum of a number and its reciprocal is
10. What is the number? It also says I need to cheack.
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Please and Thank You=) A rancher is planning to put up 220 yards of fencing. In the morning she puts up 80 yards, and in the afternoon she puts up 40% of the remaining fence. What percent of the fence did she put up that day?