Ok, so the only possible/reasonable answer is:
Yesenia has 1 base ten block and 7 cubic inches blocks.
(8 blocks in total)
(total units: 17)
while, Misty has 6 base ten blocks and 8 cubic blocks.
(14 blocks in total)
(total units: 68)
68+17=85 (85 is the total number of units, with Misty and Yesenia added together, as said in the word problem)
14-8=6 (6 is the total number of blocks Misty has more the Yesenia, as said in the word problem)
14+8=22 (22 is the total number of blocks Misty and Yesenia have altogether)