book Maths Puzzle Numerical Ability

x/3+3x/4=13/3

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book Other Question

Joe digs a ditch in 3.2 hours.
Joe working with George can did the same length ditch in 2.7 hours.
How long would it take George to dig the ditch by himself.
IF a =0.65 AND b= 1.28 AND c= -5/2, EVALUATE,
-a - (-b) + 4.2 =