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A 7 sided heptagon would fit the given description
A hexagonal based pyramid seems to fit the given description
The figure given in the question is not a decimal number.
From the information given, we know that 'Y' is 27.But we don't know anything about 'X'.
2 + 5 always equals seven. This is a mathematical fact, and 2 + 5 will never equal something other than seven. Note that in symbolic form, '7' is not appropriate given the use of different bases. please note that 2 + -5 or -2 + 5 or even -2 + -5 do not add up to seven