book Maths Puzzle Numerical Ability

How many different arrangements of 9 letters can be formed from the letters in the word "SEVENTEEN" ?

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book Other Question

D= -200p + 35,000
The supply equation is predicted to be
S= -p^2 + 400p - 20,000
Find the equilibrium price. How much water must be added to 180 grams of a solution that is 35% acetic acid to produce a solution that is 10% acetic acid?