Quantitative Aptitude Revision Notes

QUESTRA — Quantitative Aptitude Revision Notes
Percentage change = (new - old) / old x 100
Average = sum of values / number of values
Simple interest = principal x rate x time / 100
Work rate = 1 / time taken
Combined work rate = sum of individual work rates
Speed = distance / time
Example: 25 percent of 240 = 60.
Example: A 10-day worker and a 15-day worker together take 6 days.