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15 is the second odd number from 12
36 times 10^3 plus fifteen times 10^2 is equal to 37,500.
Standard form: 1.5*10-1 seconds, expanded form: (0.1 + 0.05) seconds.
Fifteen is the answer.
If you have one cube in the first solid than six cubes in the second solid and than fifteen cubes in the third solid, than you would get 215 cubes in the eighth solid.