exam Maths Puzzle Numerical Ability

A grocer wants to mix peanuts and cashews to produce 20 lb of mixed nuts worth $6.20/lb. How many pounds of each nut should she use if peanuts cost $4.80/lb and cashews cost $8/lb?

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What is the formula for sound measured in decibals? pick a sound,give decibals of the sound and explain what this measurment means? Two classes, one with 50 students and the other with 30, take the same exam. The combined average of both classes is 84.5. If the larger class averages 80, what is the average of the smaller class?