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

At 7A.M. , the temperature was -15 oF, By 1 P.M. ,the tempature had increased by 18 oF. What was the temperature at 1 P.M. ? How do you solve these problems? z/20+1/12=z/15-1/10 and 4w+23/5=19-w/7