exam Maths Puzzle Numerical Ability

please help me solve this problem 20-4X=20-12

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The manager of an orange grove is trying to decide when to pick the oranges. If they are picked now, the average yield per tree will be 80kg, which can be sold for $1.20 per kg. Pa As light penetrates a body of water , its intensity"I" measured in candela/cm^2 decreases exponentially. For one particular pond it is known that the light intensity at the surface