This is an original preparation plan, not a new examination announcement. Check dates, stages, eligibility and application instructions in the issuing authority’s current notice.
01 / UNDERSTANDING
Plan your preparation
Learn weighted averages before mixture shortcuts. Alternate direct blending and removal cases, checking the component amount after each stage so replacement errors become easy to locate.
02 / UNDERSTANDING
The concept in context
A mixture percentage is a component amount divided by the mixture’s total amount. When combining solutions, calculate the component in each portion and add both the component amounts and total volumes under the stated additive-volume assumption. Equal percentages should not be averaged directly when the mixed volumes are unequal.
03 / UNDERSTANDING
A worked learning case
Original educational case. Ten litres of a 20% solution contain two litres of the named component. Twenty litres of a 50% solution contain ten litres. Assuming volumes add, the mixture contains twelve litres in thirty litres, or 40%. The larger, stronger portion receives more weight, so the result is above the unweighted mean of 35%.
ORIGINAL EDUCATIONAL PRACTICE
Try it before you check.
Original practice: Combine 5 litres at 20% concentration with 5 litres at 40%, assuming additive volumes. What is the final concentration?
Show the answer and reasoning
30%.
The portions contain one litre and two litres of the component respectively, giving three litres in a total of ten litres. The concentration is 3/10 × 100 = 30%. Equal volumes make the simple mean valid in this particular case; unequal volumes would require different weights rather than the same shortcut.
Two traps to watch for.
- Averaging concentrations despite unequal mixture quantities.
- Removing a mixed portion as if only one component leaves.
YOUR TOPIC-SPECIFIC LEARNING MAP
Build your next study session
Calculate component amount before mixing.
Track total volume separately.
Explain why the resulting concentration lies between inputs.
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.
- sbi.bank.in https://sbi.bank.in/web/careers/current-openings
- sbi.bank.in https://sbi.bank.in/webfiles/uploads/files_2627/09/SBI_JA-Customer_Support_Sales-IH_Pre-2026-27_Eng.pdf
For SBI preparation, check the current official notice before relying on changing dates, rules or examination requirements.
