exam Maths Puzzle Numerical Ability

The right circular cone has a volume = 24(pi=3.14)cubic cm and r = 3, What is the height?

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exam Other Question

7y+4=3-2y please help!!!

2z+14+18=6z+3

and

3x-2 over 3 - 5x+1 over 4 greater than equal to 0