exam Maths Puzzle Numerical Ability

please help me answer this question: 10z-(3z-11)=17

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A coffe merchant has coffee beans that sell for $9 per pound and $12 per pound. The two types are to be mixed to create 100lb of a mixture that will sell for $11.25 per pound. How much of ech type of bean should be used in the mixture? A 25-foot ladder leaning against a building touches the wall 18 feet above the ground. How far from the building is the bottom of the ladder? Help please. Thank you