This three-hour session is a high-volume review of quantitative arithmetic problems—claimed by the instructor to be frequently repeated types from the last five years of bank exams (RRB PO, IBPS Clerk, SBI Clerk). The content focuses heavily on standard syllabus topics (Time & Work, Partnership, SI/CI, Boats & Streams, Averages, Mensuration). While the mathematical complexity is generally low, emphasizing formula application and basic ratio manipulation, the lecture is padded with extensive audience engagement, score checks, and promotional efforts (including a long mid-session break and a course offer). Approximately 56 rapid-fire problems are addressed, with the instructor occasionally warning against overly complex questions that would be inefficient to solve during a timed exam.
Arithmetic Review for Bank Exams (56 Problems, 3 Hours)
0:01:34 Introduction and Pacing: The session begins with protracted greetings and mandatory check-ins regarding student mock scores (Quant vs. Reasoning) and exam dates, inefficiently delaying the actual content until 0:04:17.
0:05:34 Boat and Stream (Ratios): Demonstrates finding downstream travel time (15 minutes) using time-speed inverse ratios (3:2) when distance is constant, leading directly to the V:S ratio (3:1).
0:19:34 Efficiency and Useless Data: Solves a pipe/cistern problem, noting that redundant information (lines about additional people/taps) was included solely to confuse the candidate. The solution requires only finding the individual efficiency of A (1 unit/min).
0:29:14 Average (Substitution Method): Solves an average problem involving finding the difference in weight between two new people (12 kg), quickly deriving the variable $X=78$ by balancing the sum before and after the additions ($6X + 180 = 8(X+3)$).
0:36:26 Boat and Stream (Relative Speed Conversion): Solves for Boat Q's upstream time (160 minutes) by first establishing Boat P's component speeds (V=15, S=3) and then defining Q's still water speed (21 km/h) based on P's downstream speed.
0:42:13 Train/Time (Observation): Solves a relative speed problem (Train P speed 30 m/s) by recognizing that the time taken to cross a tunnel (3L) in 18s implies the train covers its own length (L) in 6s. This key observation significantly reduces calculation steps.
1:02:41 Profit and Loss (Unitary Method): Determines a new selling price (₹6250) based on a flat 25% profit, relying on the calculation that the initial 4-unit profit margin equals ₹200.
1:06:33 Age/Average (Difference): Efficiently solves a multi-person age problem (Nisha's future age 31) by subtracting the sums of the groups to find the relationship between the outlier ages (Kiran - Nisha = 6 years).
1:08:53 Profit/Loss (Discount Leverage): Uses a critical observation: the increase in profit (₹480) when selling at Marked Price (MP) instead of Selling Price (SP) is exactly equal to the discount value (25% discount). This quickly sets up the unit value, yielding a Cost Price of ₹1200.
1:12:01 SI/CI (Time Waster Alert): Addresses a calculative problem involving the difference in amounts between SI and CI investments (P1+P2=18000). The instructor notes that this type, though solvable (P1=9000), should typically be skipped early in an exam due to complexity and the high risk of mathematical errors.
1:38:35 Boat and Stream (Complex Scenario): Solves a combined travel problem ($30/D + 36/U = 2$ hours) by using speeds derived from time ratios (D:U 5:3) and relying on trial and error (substituting $x=9$) to avoid forming a quadratic equation. Upstream speed 27 km/h.
1:40:40 Exam Strategy Critique: Interjects to advise students to aim for $\approx 60$ marks total (25 Quant/35 Reasoning) in the 80-mark paper, setting a realistic, skeptical baseline attempt target.
1:45:41 Mensuration (Redundant Info): Solves for the curved surface area of a cylinder (3696), noting that the context of a right-angled triangle was irrelevant noise, as only two perpendicular sides (R=21, H=28) are used for calculation.
2:21:20 Course Promotion and Break: An unnecessarily long 20-minute break is taken, followed by explicit promotion of courses available for a short time frame, which I don't care about.
3:05:57 Probability (Combinatorics): Calculates the probability of drawing three balls of distinct colors (3/14) from a box of 36 total balls, requiring the application of $nCr$ principles and recognizing the total count of blue balls (17) from the difference.
3:13:29 Probability (Dice Sum): Terse and efficient calculation of the probability (1/18) that the sum of two thrown dice is a prime number above 10 (only 11 is possible, with 2 favorable outcomes).
3:17:56 Conclusion: The session wraps up after exactly three hours, fulfilling the promised time length, having covered a high volume of structured but mostly non-challenging material.