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At least how many grams of copper must be alloyed with 387g of pure silver to produce an alloy that is no more than 90% pure silver?
If Maura were able to increase her average cycling speed by 3.5km/h, she would be able to cover in 2h a distance at least as great as that which now takes 3h. What is her best average speed at present?
Two less than one-sixth of a certain number is 1 more than one-fourth that number. What is the number?
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