Bonjour
C = 3/12 - 3/16
C = (3 x 4) / (12 x 4) - (3 x 3) / (16 x 3)
C = 12/48 - 9/48
C = 3/48
C = (3 x 1) / (3 x 16)
C = 1/16.
D = 8/25 + 1/60
D = (8 x 12) / (25 x 12) + (1 x 5) / (60 x 5)
D = 96/300 + 5/300
D = 101/300
E = 7/21 + 3/56
E =(7 x 8) / (21 x 8) + (3 x 3) / (56 x 3)
= 56/168 + 9/ 168
= 65/168.
