SSC CGL Quant · Chapter Test
Average, Mixture & Alligation — 25-Question Test
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Formula Reference Sheet
This chapter
Average
| Average | sum of values / number of values |
|---|---|
| New average on adding x | recompute (old sum + x) / (n + 1) |
| Average speed (equal distances) | 2ab / (a + b) |
Alligation
| Alligation rule | cheaper:dearer = (dearer - mean) : (mean - cheaper) |
|---|---|
| Repeated replacement | final = initial x (1 - r/V)^n |
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