This Bankers Tutorial article is independent educational material. Examples are illustrative, and changing rules or examination requirements should be checked at the official source.
01 / UNDERSTANDING
Understand the idea
A balance equation tells a short story about what was available and where it went. Writing that story before arithmetic often makes the unknown immediately visible.
02 / UNDERSTANDING
The concept in context
A missing-value problem becomes manageable when its balance relationship is explicit. For a total, the unknown is the total minus the sum of known disjoint parts. For a running balance, closing equals opening plus inflows minus outflows. Label each amount by its role before placing it into an equation.
The method relies on complete, non-overlapping categories and consistent periods. An average needs both a total and a count, while a balance may include adjustments stated separately. If the question does not provide enough independent constraints, a unique missing value cannot be invented. Substitute the result into the original relationship as the final check.
03 / UNDERSTANDING
A worked learning case
Original educational case. An original study register starts with 45 pending exercises, adds 30 new ones and ends with 20 pending. If completion is the only outflow, 55 exercises were completed: 45 + 30 − 55 = 20. The answer would change if the register also recorded cancellations, so that exclusion must be explicit rather than assumed silently.
ORIGINAL EDUCATIONAL PRACTICE
Try it before you check.
Original practice: Opening stock is 80 units, receipts are 35 and closing stock is 50. With issues as the only outflow, how many units were issued?
Show the answer and reasoning
65 units.
The balance equation is closing = opening + receipts − issues. Rearranging gives issues = 80 + 35 − 50 = 65. Substitute to check: 80 + 35 − 65 = 50. The wording excludes other losses or adjustments, so no additional outflow needs to be estimated in this original practice case.
Two traps to watch for.
- Subtracting receipts instead of adding them to available stock.
- Inventing losses or cancellations that the problem does not state.
YOUR TOPIC-SPECIFIC LEARNING MAP
Turn understanding into practice
Name each quantity’s balance role.
Write the full equation before rearranging.
Substitute the missing value into the original relationship.
Explain the idea, apply it to a new situation, then check what changed in your reasoning.
BANKERS TUTORIAL · SOURCE NOTES
Keep the source alongside your notes.
Official links provide subject context and authoritative reference material. This guide’s explanation, scenario and question are original Bankers Tutorial learning content.
- www.ibps.in https://www.ibps.in/
- www.ibps.in https://www.ibps.in/index.php/faq/
For IBPS & RRB preparation, check the current official notice before relying on changing dates, rules or examination requirements.
