In this article we learn how we can calculate DI questions easily by developing tricks

### The questions will be of following types:

- X is what percentage of Y= X/Y * 100
- Y is what percentage of X= Y/X * 100
- X is what percentage less than Y= Y-X/Y * 100 ( X is what percent less than Y means indirectly we can observe Y is greater than X, So we are subtracting Y(higher value)-X(lower value), denominator depends upon with which it is compared.
- Y is what percentage more than X= Y-X/X * 100 ( Y is what percent more than X means indirectly we can observe Y is greater than X, So we are subtracting Y(higher value)-X(lower value), denominator depends upon with which it is compared.

### Frequently asked Questions:

**To find 195/225 * 100**

#### TRICK 1:

Calculate in mind

Take 225 =100%

195 =?

22.5 =10% , 225-195=30 , 22.5+6.5=30=10%+3%=13% (approx)

2.25= 1% , 30=?, 100-13=87% (answer)

Take 225 =100%

195 =?

22.5 =10% , 225-195=30 , 22.5+6.5=30=10%+3%=13% (approx)

2.25= 1% , 30=?, 100-13=87% (answer)

#### TRICK 2:

Doubling method (double it until you feel the value is comfortable to calculate)

225 ,450, 900=100%, 90=10%, 9=1%

30, 60, 120=? (13%) (approx)

100%-13%=87% (Answer)

225 ,450, 900=100%, 90=10%, 9=1%

30, 60, 120=? (13%) (approx)

100%-13%=87% (Answer)

### Question: If ratio is asked to find

#### TRICK:

Double the number whenever we observe 5 at the ending

=195:225

=390:450

=13:15(Answer)

=10-10+25+85+35/5

=29(Answer)

For cricket 50+25+15=90/5= 18--------(1)

For tennis 40+10-70-35=-55/5= -11--------(2)

=18-(-11) = 29(Answer)

=195:225

=390:450

=13:15(Answer)

### Question: What is the difference between Average of Cricket and Average of Tennis?

Cricket |
250 | 200 | 225 | 215 | 200 |
---|---|---|---|---|---|

Tennis |
240 | 210 | 200 | 130 | 165 |

#### TRICK 1:

Subtract and take average=10-10+25+85+35/5

=29(Answer)

#### TRICK 2:

Take 200 base valueFor cricket 50+25+15=90/5= 18--------(1)

For tennis 40+10-70-35=-55/5= -11--------(2)

=18-(-11) = 29(Answer)

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