Number before and after a blank cell then the cell should get an x in the row

[Stephen_IV]

Question 1:
The message is a continuation from the link below. I want to thank Andrew for answering that question but now I need to put an x at the end if it meets the condition (like in the example below) the boss wants this for counting. For those who are new to this post, If the is number before and after a blank cell then the cell should get an x in the row.

http://www.mrexcel.com/forum/showthread.php?t=537952

Question 2:
If there a way using MMULT to get a total count in a cell based on all rows, for the example below it would be 4!

Thanks in advance Stephen

Book1
	A	B	C	D	E	F	G	H	I	J	K	L	M	N	O	P	Q	R
1						3/7	3/8	3/9	3/10	3/11	3/14	3/15	3/16	3/17	3/18	3/21	3/22
2						2	2	2	2	2	2	2	2	2
3						101	101	101	101	101	101	101	101	101	101	101
4						30	30	30	30	30			54	54				x
5						101	101	101	101	101	101	101	101	101	101	101
6						101	101	101	101	101	101	101	101	101	101	101
7						5
8						22		32	32	32	32	32	32	32	32	32	32	x
9						101	101	101	101	101	101	101	101	101	101	101
10						2	2	2	2	2	2	2	2	2
11						101	101	101	101	101	101	101	101	101	101	101
12						22	22
13						2	2	2	2	2	2	2	2	2
14						101	101	101	101	101	101	101	101	101	101	101
15						101	101	101	101	101	101	101	101	101	101	101
16						10	10	10		10	10	10
17						101	101	101	101	101	101	101	101	101	101	101		x
18						36	36	36	36	36	36	36	36	36	36
19						10
20						20
21						101	101	101	101	101	101	101	101	101	101	101
22						90	90	90	90	90	90	90	90
23						25	25		10	10	10	10	10	10	10	10	10	x
Sheet1