exam Maths Puzzle Numerical Ability

What are the four properties of equality

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exam Other Question

Carol has more than 80 coins, all nickels and dimes. She has dimes than nickels. What is the least number that Carol can have. multiply 5x-15/3x+9 * 4x+12/6x-18
a. 10/9
b. 10(x+3)/9(x-3)
c. 5(x+3)
d. 1