book Maths Puzzle Numerical Ability

If the probability that it will snow on Christmas in Burlington, Vermont is 0.8, what is the probability that it will NOT snow?

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to simplify a fraction with the square root of a negative number in the denominator can we multiply the fraction by the square root of the neg number over the square root of the sa One-fifth of a number added to the number itself gives 42. Find the number. If I set this up as 1/5x + x = 42 and mutplied each side by 5, but this does not do it. I end up with 2x = 210. I know the answer is 35. How do I get to 6x = 210?