exam Maths Puzzle Numerical Ability

The edges of three cubes are consecutive odd integers. If the cubes are stacked as shown the total exposed surface area is 381 cm2. Find the lengths of the sides of the cubes.

i need an equation for this pls..

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exam Other Question

Ed and Dave are going to divide a case prize of $14,000 in a ratio of 2 to 5. How much will Dave receive?

I came up with 8,000. I am not sure this is correct. Could you verify this for me? Thanks. Solve then graph 7x_>28
Of course the _ is supposed to be under the > Would it be a clear, or solid circle when graphing it?