book Maths Puzzle Numerical Ability

what is 20% of 625.57
The answer would be 125.114, but the way you solve it is by muliplying 625.57 by .20 (which is 20% with the decimal moved two places to the left).

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book Other Question

Simplify the radical expression:

I guess you could type it:

^4 (square root symbol)162x^5
_______________________________=
^4 (square root symbol)2x

the ________________
What is 25% more thank 28?
My answer was 35. Is that right?
Thanks