Concept: The question tests on Word Problem

Solution:

Given the following data

S + 2T = 105 ... (1)

2S + T = 135 ... (2)

Eliminating S by doing the operation (2 * Equation 1) - Equation 2

2S + 4T - (2S + T) = (2 * 105) - 135

3T = 75

T = $25

Option B