THE ANSWER :- h = 93.88 cm
Step by step:-
Generally speaking, 19/8 is 2.375 so they should be 28.5 inches apart. however you gotta factor in how thick the shelves themselves are :)
He can either download both the pedometer and the math apps,
or he can download only the photo app and no more.
Pedometer + math = 0.54 GB. Fits in 0.64 GB.
Photo = 0.403 GB. Fits in 0.64 GB, but only 0.237 GB left.
Not enough for pedometer (0.24)
or math (0.3) .