exam Maths Puzzle Numerical Ability

What is the formula for sound measured in decibals? pick a sound,give decibals of the sound and explain what this measurment means?

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exam Other Question

1/2x + 2/5 (x-2) = 1 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?