Answer:
a + b = 57/16
Explanation:
(3/8 + 15/16) / 2 = 21/32
(21/32 + 15/16)/2 = 51/64
51/64 - 15/16 = 15/16
3/8 + 15/16 = 21/16
21/16 + 15/16 = 9/4
3/8, 21/16, 9/4, 15/16
21/16 + 9/4 = 57/16
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