Quantitative Aptitude - Arithmetic Ability Questions

The population grew from 3600 to 4800 in 3 years. That is a growth of 1200 on 3600 during three year span.

Therefore, the rate of growth for three years has been constant.

The rate of growth during the next three years will also be the same.

Therefore, the population will grow from 4800 by 4800*13= 1600

Hence, the population three years from now will be 4800 + 1600 = 6400

NOTE :

Repetition of leap year ===> Add +28 to the Given Year.

Repetition of non leap year

Step 1 : Add +11 to the Given Year. If Result is a leap year, Go to step 2.

Step 2:  Add +6 to the Given Year.

Solution : 

Given Year is 1993, Which is a non leap year.

Step 1 : Add +11 to the given year (i.e 1993 + 11) = 2004, Which is a leap year. 

Step 2 : Add +6 to the given year (i.e 1993 + 6) = 1999

Therfore, The calendar for the year 1993 will be same for the year 1999

Speed in still water = 6 kmph

Stream speed = 1.2 kmph

Down stream  = 7.2 kmph

Up Stream = 4.8 kmph

x/7.2 + x/4.8 = 1

x = 2.88

Total Distance  = 2.88 x 2 = 5.76 kms

         Milk             Water 

         74%             26%        (initially) 

         76%             24%        ( after replacement) 

  Left amount = Initial amount 1-replaced amounttotal amount 

   24  = 261-7k

=> k = 91 

Let B's capital be Rs. x. 

Then,3500×127x=23

=> 14x = 126000 

=> x = 9000.