Eduqo
Quantitative Aptitude›Ch 5: Data & Speed Maths›Quant Ultimate Formula Revision
One-page high-yield formulas and calculation traps for SSC, Railway & Defence
Speed and accuracy depend on memorizing core formulas and avoiding common calculation traps in exam conditions.
Quick Memory Hooks
| Topic | Formula | Application |
|---|---|---|
| Profit & Loss | SP = CP × (100 ± P/L)% / 100 | Finding Selling Price |
| Simple Interest | SI = (P × R × T) / 100 | Interest calculation |
| Compound Interest | A = P(1 + R/100)^t | Amount calculation |
| Average Speed | 2xy / (x + y) | Equal distance travel |
Circle Area
(Pi r square)
Pi r square
Area of circle with radius 7 cm is 154 sq cm.
Cylinder Vol
(Pi r sq h)
Pi r sq h
Volume of cylinder determines liquid capacity.
Cone Slant
(Root r sq + h sq)
Root r sq + h sq
Slant height l connects radius and vertical height.
Sphere Vol
(Four third pi r cube)
Four third pi r cube
Solid ball volume follows this standard formula.
Successive 20% & 10% discount is 30%Successive discount is 28%
Always apply net percentage formula a + b - (ab/100).
CI for 2 yrs = Simple Interest for 2 yrsCI = SI + Interest on Interest
CI is always slightly greater than SI for more than 1 year.
Average speed = Average of two speedsAverage speed = Total distance / Total time
Never average speeds directly unless time taken is equal.
Q1.What is the average speed if a man travels equal distances at 40 km/h and 60 km/h?
Q2.Find the compound interest on Rs. 1000 at 10% per annum for 2 years.