book Maths Puzzle Numerical Ability

a chemist mixes 10% hydrochloric acid solution with at 20% hydrochloric acid solution. how many milliliters of each should the chemist use to make a 600 ml solution that is 13% hyd

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will you please help me factor this equation: 16k squared minus 80k plus 100. thankyou connie has $10 to buy doughtnuts and coffee. she needs to buy coffee,whitch is $3.50, and will spend the rest on doughnuts. if the doughnuts are $0.40 each, what is the maximum number of doughnuts she can buy?