exam Maths Puzzle Numerical Ability

i have been trying to solve the following problem, but have not been successful at doing so. I need help!!! Please

square root of 6 divided by 4 nth root of 36. Thanks

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exam Other Question

1. The cost, in millions of dollars, to remove x % of pollution in a lake modeled by c=6000/200-2x

a. What is the cost to remove 75% of the pollutant?

b. What is the cost to
Ricardo is 4 years less than twice as old as his sister. The sum of their ages is 20. How old is Ricardo?

Thanks