exam Maths Puzzle Numerical Ability

domain and range of y=2/3x-5

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Translate the following into a quadratic equation, and solve it:

the length of a rectangluar garden is three times its width; if the area of the garden is 75 square meters, what are the dimensions? please help me solve this equation:
one pump can fill a tank with oil in 4 hours. a second pump can fill the same tank in 3 hours. if borh pumps are used at the same time, how long will they take to fill the tank.