book Maths Puzzle Numerical Ability

Solve (q+4)(3q-15)= 0

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Please help me. I need to know how to compute the intercepts of a quadratic function, and In case of a quadratic function, why are there two x-intercepts and one y-intercept? the time it takes to complete a certain job varies inversely to the number of people working on that job. If it takes 36 hrs for 7 carpenters to frame a house, how long will it take 54 carpenters to do the same job?