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Aptitude Day 46


Answers of Day 45:
                                1. 9/14
                                2. 4

1. The product of 2 natural numbers is 15. Then, the sum of the reciprocals of their squares is:

Solution:
                Let the numbers be x and y.
                1/x2 +1/y2= (y2+x2)/x2y2
                                 = (152+12)/(1*15)2
                                 =  (225+1)/225
                                 =  226/225.

2. If 3(1/2) is added to a number and that sum is divided by 2(3/5) and the result of this is added to 2/3. This value will be equal to 5. What's that number?

Solution:
               Let the number be x.

                x+3(1/2)
               -------------   +  2/3 = 5
                 2(3/5)

                  x+7/2 
               -------------    +  2/3 = 5
                   13/5

                 2x+7           5
               ---------  *    ----    +   2/3 = 5
                    2             13

                10x+35          2
               -----------  +  -----  = 5
                    26              3

                  30x+105+52
                  ---------------  = 5 
                         78
                
                        x = 7(23/30).

              Therefore the number is 7(23/30).







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