Here’s another set of video explanations (one math, one verbal) of practice problems found in ETS’s Paper-based Practice Test for the Revised GRE, a PDF released by the test-makers themselves.
You can find the whole set of explanations for every practice problem here. Enjoy!
Math: Section 5, Question #15 on page 76, a Numeric Entry question that begins: “The total amount of Judy’s water bill for the last quarter of the year was $40.50. The bill consisted of a fixed charge of $13.50…”
Verbal: Section 3, Question #15 on page 56: a Sentence Equivalence question that begins, “Early critics of Emily Dickinson’s poetry mistook for simplemindedness the surface of artlessness…”