187. 3 th 1 (2,75 - 15/40)

3 th 1 (2,75 - 3/8) = 3 th 1 (20/8 - 3/8) = 3 th 1 (17/8) = 3 th 1 (2 1/8) = 3 th 1 (9/8) = 27/8 = 3 3/8