book Maths Puzzle Numerical Ability

1/2 kids have left party
18 kids are standing around
1/3 are dancing
how many kids were originally at party

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book Other Question

log(x^2)=2logx This one is also true right? Thank you for you help. Find all the real values of x for which the function: f(x) = 18x^3 - 33x^2 + 20x - 4 becomes zero.