Notifications

Fractions  

   RSS

1

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

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

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

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.

Share: