exam Maths Puzzle Numerical Ability

9/11-3/11+7/11=??

Help again please, I never understood the fraction stuff and still dont. I always forget which goes with what. Can someone help me please?

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exam Other Question

if an area of a circle is to be roped off by a rope 10m long, what will be the radius of this area? round your answer to two decimal places CAN A FRACTION, A DECIMAL POINT, OR A NEGATIVE NUMBER HAVE A ABSOLUTE VALUE ?