exam Maths Puzzle Numerical Ability

(Nine more than the product 4 and the number is 73). I am helping my niece and I am stumped, Help.....

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Solve these using the multiplication principle.
- x/4 = 11

- 3/5x=12/35 4. The demand equation for a certain computer chip is given by D=-15p+145 The supply equation is predicted to be S=-p^2+45p-270 Find the equilibrium price.