exam Maths Puzzle Numerical Ability

The length of a whale is 7/3 meters more than half of its length. What is the length of the whale in cm?

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exam Other Question
Linear Programming
C= 2x + 4y

constraints:
x < 3
x + y < 3
2x - 3y > -9

I'm lost! how to solve a rational equation like this one 8/x+1/3=5/x