exam Maths Puzzle Numerical Ability

The average age of a class of 25 boys in increased by two years when in place of a student having age 12 years, the headmaster is included. Find the age of the headmaster?

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2. The break even values for a profit model are the values for which you earn $0 in profit. Use the equation you created in question one to solve P = 0, and find your break even values. GIVEN THE FUNCTIONS F(X)= 3X^2-5X+4, G(X)=3X/X-2, H(X)=THE SQUARE ROOT OF 2-X FIND:

F(X-1), G(X+H), AND H(X+2). COULD YOU SHOW ME STEP BY STEP HOW YOU WOULD SOLVE THESE PROBLEMS? THANK YOU VERY MUCH