exam Maths Puzzle Numerical Ability

6 square root 12 over 3 square root 6

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exam Other Question

Write the fraction as a percent.
1 1/5 (One and one/fifth)

can someone please help me with this? I have never been good with these kind of problems and obviously nothing has changed. I just do not understand how to do this. I have made many attempts to answer this equation and cannot come up with the answer - please help. The problem is -2(x-b)-(5a-x)=a+b