Sal has done all problem solving problems in "The Official Guide for GMAT Review" by the Graduate Management Admission Council (which he recommends you buy) in the videos below.
Lectures
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Lecture 1 - GMAT Math 1
1-6, pg. 152.
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Lecture 2 - GMAT Math 2
7-11, pg. 153.
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Lecture 3 - GMAT Math 3
12-19, pgs. 153-154.
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Lecture 4 - GMAT Math 4
20-23, pgs. 154-155.
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Lecture 5 - GMAT Math 5
24-29, pgs. 155-156.
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Lecture 6 - GMAT Math 6
30-35, pg. 156.
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Lecture 7 - GMAT Math 7
36-41, pgs. 156-157.
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Lecture 8 - GMAT Math 8
42-48, pgs. 157-158.
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Lecture 9 - GMAT Math 9
49-54, pgs. 158-159.
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Lecture 10 - GMAT Math 10
55-60, pg. 159.
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Lecture 11 - GMAT Math 11
61-64, pg. 160.
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Lecture 12 - GMAT Math 12
65-69, pgs. 160-161.
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Lecture 13 - GMAT Math 13
70-75, pg. 161.
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Lecture 14 - GMAT Math 14
76-80, pg. 162.
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Lecture 15 - GMAT Math 15
81-86, pgs. 162-163.
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Lecture 16 - GMAT Math 16
87-91, pg. 163.
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Lecture 17 - GMAT Math 17
92-95, pg. 164.
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Lecture 18 - GMAT Math 18
96-99, pgs. 164-165.
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Lecture 19 - GMAT Math 19
100-104, pg. 165.
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Lecture 20 - GMAT Math 20
106-109, pg. 166.
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Lecture 21 - GMAT Math 21
110-114, pgs. 166-167.
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Lecture 22 - GMAT Math 22
115-119, pgs. 168-169.
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Lecture 23 - GMAT Math 23
120-123, pg. 168.
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Lecture 24 - GMAT Math 24
124-128, pgs. 168-169.
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Lecture 25 - GMAT Math 25
129-132, pgs. 169-170.
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Lecture 26 - GMAT Math 26
133-137, pg. 170.
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Lecture 27 - GMAT Math 27
138-142, pg. 171.
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Lecture 28 - GMAT Math 28
143-147, pgs. 171-172.
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Lecture 29 - GMAT Math 29
148-153, pgs. 172-173.
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Lecture 30 - GMAT Math 30
154-160, pg. 173.
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Lecture 31 - GMAT Math 31
161-162, pg. 174.
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Lecture 32 - GMAT Math 32
163-166, pg. 174.
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Lecture 33 - GMAT Math 33
167-172, pgs. 174-175.
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Lecture 34 - GMAT Math 34
173-176, pgs. 175-176.
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Lecture 35 - GMAT Math 35
177-180, pg. 176.
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Lecture 36 - GMAT Math 36
180(simpler)-184, pgs. 176-177.
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Lecture 37 - GMAT Math 37
185-189, pgs. 177-178.
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Lecture 38 - GMAT Math 38
190-194, pg. 178.
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Lecture 39 - GMAT Math 39
195-197, pgs. 178-179.
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Lecture 40 - GMAT Math 40
198-200, pg. 179.
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Lecture 41 - GMAT Math 41
201-204, pgs. 179-180.
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Lecture 42 - GMAT Math 42
205-206, pg. 180.
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Lecture 43 - GMAT Math 43
207-209, pgs. 180-181.
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Lecture 44 - GMAT Math 44
210-213, pg. 181.
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Lecture 45 - GMAT Math 45
214-216, pg. 181.
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Lecture 46 - GMAT Math 46
217-220, pg. 182.
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Lecture 47 - GMAT Math 47
221-225, pgs. 182-183.
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Lecture 48 - GMAT Math 48
226, pg. 183.
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Lecture 49 - GMAT Math 49
227-231, pgs. 183-184.
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Lecture 50 - GMAT Math 50
232-236, pgs. 184-185.
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Lecture 51 - GMAT Math 51
237-239, pg. 185.
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Lecture 52 - GMAT Math 52
240-244, pgs. 185-186.
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Lecture 53 - GMAT Math 53
245-247, pg. 186.
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Lecture 54 - GMAT Math 54
248-249, pg. 186.

