Here in this blog , we are discussing about ADF – Interview Aptitude Questions with some basic examples . Some of them are :  

1. What is the minimum number of square marbles required to the floor of length 5m 78 cm and width 3m 74cm.

SOLUTION :
            Length = 5m 78cm = 578cm
          Breadth = 3m 74cm = 374cm

               LCM of 578 and 374 = 6358
                HCF of 578 and 374 = 34

  Required minimum number of tiles = 6358 / 34

        Required minimum number of tiles = 187
                                          —————————–
2. Find the degree of the clock hand 2 hours and 40 minutes

SOLUTION :
             Angle traced by the clock hand in 24 hours = 360 degree
            Angle traced by it in 2 hours 40 minutes ie) 8/3 hours  

                                             = 360/12 * 8/3

                                             = 10 * 8 = 80 degrees

                                       ————————-
3. How many times a day clock hand coincide with each other ?

SOLUTION:
      The hands of a clock coincide 11 times in every 12 hours.

   ( Since between 11 and 1 they coincide only once ie) at 12 o’clock)
Hence they coincide with each other 22 times in a day.
                      —————————

4. If Rs. 100 is doubled in compound in 5 years then how many years would it take to another Rs. 200 ?

SOLUTION :

                Principal amount = Rs.100
            Compound interest = Rs. 100
                                         Time = 5 years

Rate % =   Compound Interest * 100                   100 * 100
                  ————————————— =         ————- = 20 %
                     Principal * Time                                       100 * 5

           => Rate = 20 %

Hence the new principal = Rs.100 , rate = 20 % and the time = x years

Time = Compound Interest * 100                   100 * 100
                 ——————————-                 = ————- = 5 years
                     Principal * rate                                    100 * 20

Hence after 5 years the principal amount gets twice in its share 

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