exam Maths Puzzle Numerical Ability

Please help me siplify the following:

{[8/27)^3:(2/3)^2]^4:(4/9)^10}:(2/3)^6

Thank you
Rosanna

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exam Other Question

If D=st and s=300,000km t=2.5 second, how far is the moon if it takes 2.5 sec to travel to the earth and back(in km)? Chapter:The Elimination Method
2m=2-9n
21n=4-6m