Two-piece double exponential distribution (TPDE) with one piece (X≤0) having the scale parameter θ_1 while the other piece (X＞0) having θ_2 is considered here. Distribution of the sum of n-independent variables from such a distribution is obtained. Special cases of this distribution are also treated. Next, distribution of the ratio of two independent (TPDE) variables is derived, As an extension, distribution of x_1/x_2x_3 is expressed terms of hypergeometric functions. A small table gives the power of the test regarding double exponential against (TPDE).