exam Maths Puzzle Numerical Ability

I am having trouble solving these problems. Could you kindly help me.

1. 1/3s+7/9=4/3s

2.In 2010 world grain supply will be 1.8 trilliam metric tons and the supply will be

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exam Other Question
sqrt (5^2-4(2)(-3)) I need to find the maximum and minimum volumes of these equations in order to find the max and min of the boxes.

a. v(x)= x(39-2x)(53-2x)
b. v(x)= x(38-2x)(55-2x)
c. v(x)= x(