exam Maths Puzzle Numerical Ability

simplify the expression

a)square root of 45
b)square root of 54
c)square root of 16/25
d)square root of 10/32

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exam Other Question

The sum of two numbers is 15. three times one of the numbers is 11 less than five times the other find the numbers. Infinite geometric series.
The question asks me to write the repeating decimal .999... as a fraction.
I think it is 9/9.00 infinetly and then a 1 but I have no idea how yo write that.
Thanks for the help