exam Maths Puzzle Numerical Ability

next term in the sequence 81,27,9,3,...

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exam Other Question

Suppose you have 12 coins that total 32 cents. Some of the coins are nickels and the rest are pennies. How many of each coin do you have? Solve for x:
A)(3^2x)-(10(3)^x) +9=0
B)(3^x)*(3^(x+3))/(27^x)*(9^2x)=729