# Quantitative Aptitude

Quantitative Aptitude

### How to Quickly find Rate of Simple Interest

Simple interest is calculated only on the principal amount, or on that portion of the principal amount that remains. It excludes the effect of compounding....

Aptitude Shortcuts

### Shortcut of Combination and Probability

Shortcut 99:    nCr=n!/[r!(n-r)!] Question: In how many ways 2 shirts and 3 pants can be selected from 5 shirts and 7 pants? Answer: Selecting...

Aptitude Shortcuts

### Shortcut of Permutation-2

Shortcut 95: Repeated elements      n!/(a!*b!) Question: In how many ways the letters of the word “ENVIRONMENT” can be arranged? Answer: n = 11 Let,...

Aptitude Shortcuts

### Shortcut of Permutation-1

Shortcut 91: Events   Dependent=multiplication   Independent =addition Question: There 3 busses from city A to city B and there are 5 busses from city...

Aptitude Shortcuts

### Shortcut of Calendar and Clocks

Shortcut 87:                              Using the odd days Question: Find the day of birth of MS Dhoni (7 July, 1981), if 31 Dec 1999 is Friday...

Aptitude Shortcuts

### Shortcut of Heights and Distances

Shortcut 85: Using tanƟ Ɵ                                tan 0                                    0 30                            $1/\sqrt3$ 45                                  1 60                             $\sqrt3$ 90                       ...

Aptitude Shortcuts

### Shortcut of LCM and HCF

Shortcut 82: Maximum number of items per group     Take HCF Question: There are 40, 45 and 50 balls in three different colors. They have...

Aptitude Shortcuts

### Shortcut of Number system

Shortcut 77: Divisibility test Divisibleby                                    Rule 2                            Last digit of a number should be 0,2,4,6, or 8 3                            Sum of the digit should be divisible...

Aptitude Shortcuts

### Shortcut of Simple and Compound Interest

Shortcut 75: Simple interest $SI=\frac{PNR}{100}$ P = Principle amount invested or borrowed R = Rate of interest per term N = Number of terms Term...

Aptitude Shortcuts

### Shortcut of Pipes and Cisterns

Shortcut 73: One pipe fills and another empties $\frac{AB}{-A+B}$ Question: Pipe A can fill a tank in 4 hours and pipe B can empty the...