exam Maths Puzzle Numerical Ability

Ata distance of 0.5 miles from the runway, the noise level of a supersonic transport plane at takeoff is approximately 150 decibels. What is the sound wave intensity in watts per s

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You invest $6000 in two accounts paying 9% and 6% anual interest. At the end of the year, the total interest from these investments was $480. How much was invested at each rate? If your class has 15 males and 10 females in it, how many different committees consisting of 3 males and 4 females can be chosen?