exam Maths Puzzle Numerical Ability

If four out of five doctors prefer fast food, then at a convention of 445 doctors, how many prefer fast food?

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exam Other Question

I need help setting up an equation for the following question:

A 20L solution is 15% alcohol. How much water must be added to make it an 8% alcohol solution? find the value of k so that the system of the equation
x+y+3z=0
4x+3y+kz=0
2x+y+2z=0 has no a non trival solution