exam Maths Puzzle Numerical Ability

Please help me with this problem

the sequence of numbers is 16,24,__,54,81..
what number belongs in the third position?

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exam Other Question

An air sample 4.0 ppm (parts per million) of two pollutants. The concentration of one is four times the other. What are the concentrations? please help. simplify 6/5w/2/5w thanks for the help