Let \(\left\lfloor x \right\rfloor \) denote the greatest integer less than or equal to \(x\). Find the value of \(\left\lfloor \frac { 2 }{ 5 } \right\rfloor +\left\lfloor \frac { 4 }{ 5 } \right\rfloor +\left\lfloor \frac { 6 }{ 5 } \right\rfloor +...+\left\lfloor \frac { 48 }{ 5 } \right\rfloor\).

Do not use a calculator and try to do it under 5 minutes.

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