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February 14, 2018 4:33 PM

The sum of the reciprocals of four different natural numbers is 1.85. Which of the following could be the sum of the four numbers?

3 Answers

0

February 14, 2018 5:08 PM

1.85 can be split into

1.000 1

+.500 1/2

+.25 1/4

+.1 1/10

--------

1.85

Hence 1+2+4+10=17

0

June 20, 2018 12:24 PM

Natural numbers from 1 to n are written on board.One of the numbers was erased and the new average becomes 600/17. Find the erased number ?

0

June 21, 2018 12:45 AM

Ans: 69

If there were n numbers before, then now there will n-1 numbers left.

Now, if average is 600/17, that means n-1 is multiple of 17.

With Hit & Trial, I come out with n-1=68 as the sum will be 69X70/2=2415.

And as per average, sum of n-1 numbers will be: (600/17)X68=2400.

Therefore, missing number is 2415-2400=15.