Logical Reasoning - Number Series - Discussion
Discussion Forum : Number Series - Type 4 (Q.No. 2)
Directions to Solve
Find the number that fits somewhere into the middle of the series. Some of the items involve both numbers and letters
2.
Look at this series: 664, 332, 340, 170, ____, 89, ... What number should fill the blank?
Answer: Option
Explanation:
This is an alternating division and addition series: First, divide by 2, and then add 8.
Discussion:
32 comments Page 1 of 4.
Sam said:
1 decade ago
I think the correct answer is 85 because the second number on the series from left to right 332 is less than the third number which is 340. If the same rule is applied from right to left, then 85 is the best answer.
(2)
Reet said:
1 decade ago
I think i can find a easier way..
664-332=332
340-170=170
So in the case of 89. We must have to do (89+89)= 178
So, only thats why it can continue the series like
178-89=89
Hope i can help you..
664-332=332
340-170=170
So in the case of 89. We must have to do (89+89)= 178
So, only thats why it can continue the series like
178-89=89
Hope i can help you..
Chinna said:
1 decade ago
in the above split it into 3 parts each part contains 2 nos...
in the each part the 1st no is the double of the 2nd no...
that is
664=2*332
340=2*170
178=2*89
in the each part the 1st no is the double of the 2nd no...
that is
664=2*332
340=2*170
178=2*89
Sachin kumar said:
6 years ago
The successor number is the half of the predecessor. So, choose from the option which is double of the successor of the blank given i.e 178 is double of 89.
Vamsi said:
5 years ago
I Agree that answer:
664, 332, 340, 170, ____, 89
After 2 number multiply by 2,
Like 332*2 = 664.
170 *2 = 340.
89*2 = 178 So the answer is 178.
664, 332, 340, 170, ____, 89
After 2 number multiply by 2,
Like 332*2 = 664.
170 *2 = 340.
89*2 = 178 So the answer is 178.
(1)
Karamat subhani said:
1 decade ago
If 664/340 = 1.952.
Similarly 332/170 = 1.952.
And then 340/178 = 1.952.
In this way ratio will be same and so we can say 178 is correct answer.
Similarly 332/170 = 1.952.
And then 340/178 = 1.952.
In this way ratio will be same and so we can say 178 is correct answer.
Neetu said:
1 decade ago
I agree with kenneth we have to look form both the ends from reverse way we can see the previous no. of last the no. will be the double of it.
Mihir said:
1 decade ago
1> 664/2 = 332-> 2nd number.
2> 340/2 = 170-> 4th number.
3> 89*2 = 178 (5th no) == 178/2 = 89-->6th no.
2> 340/2 = 170-> 4th number.
3> 89*2 = 178 (5th no) == 178/2 = 89-->6th no.
Buddy said:
1 decade ago
It is correct.
664/2 = 332.
332+8 = 340.
340/2 = 170.
170+8 = 178.
178/2 = 89.
89+8 = 97.
It goes on...answer is 178.
664/2 = 332.
332+8 = 340.
340/2 = 170.
170+8 = 178.
178/2 = 89.
89+8 = 97.
It goes on...answer is 178.
(1)
Abhijit said:
7 years ago
664-332=332.
340-170=170.
therefore the difference should be same thus;
178-89=89.
Hence the answer is 178.
340-170=170.
therefore the difference should be same thus;
178-89=89.
Hence the answer is 178.
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