exam Maths Puzzle Numerical Ability

A number is 2 1/10 more than its reciprocal. Find the number.
{2/3, 3/5, 5/4, 5/2}

Please teach me how to do this in order by order!!! PLEASE!!! Thank you.

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Round these to four decimal places

In12

and

log 0.65

Thanks so much for your help. How many grams of pure silver must be mixed with 450grams of an alloy that is 10% copper in order to produce a sterling silver that is 7.5% copper?