exam Maths Puzzle Numerical Ability

How many pounds of walnuts which cost $4 per pound must be mixed with 25 pounds of almonds which cost $7.50 per pound to make a mixture which will cost $6.50 per pound?

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A business invests $10,000 in a savings account for two years. At the beginning of the second year, and additional $3,500 is invested. At the end of the second year, the account ba A driver gear with 75 teeth running at 32 rpm (revolutions per minute) will transfer what rpm to a driven gear with 24 teeth?