3 4/13 *15 3/41+3 4/13* 2 3/41

3 4/13 * 15 3/41 + 3 4/13 * 2 3/41 = 3 4/13 * (15 3/41 + 2 3/41) = 
= 3 4/13 * 17 6/41 = 43/13 * 703/13 = 30229/169 = 178 147/169