Logical Reasoning - Number Series - Discussion

Thanks a lot they right its so easy first you need is
80, 10, 70, 15, 60, 20.

The first pattern is 80 you need to subtract by 10 .in the second add 5 like this
80-10 = 70,
70-10 = 60 and then so on.

The second pattern adds 5 like this
10 + 5 = 15
15 + 5 = 20 and then so on.

Hi All,

The series will goes like this:

80, 10, 70, 15, 60, 20, 50, 25, 40, 30, 30, 35, 20 40, 10, 45 ...

This series contains the following 2 series alternatively.

80 70 60 50 ---> A series with decrement of 10
10 15 20 25 ---? A series with increment of 5

Hope your understand. Have a nice day guys!

@All

Here is the logic;

1st set is 80 70 60 here if we add and subtract 10 from the middle number 70 we will get 80 and 60 series.

The 2nd set is 10 15 and x it is same as the above but here we have 5 to add and subtract from the middle number 15 if we do so we will get 10 and 20 respectively.

See the question in two halves in first it is given 80 -10 = 70.
70 -10 = 60.
In the second half it is given 10 + 5 = 15.

Now the answer is given in the second halves
So, the answer will be 15+5= 20.

Question: 80, 10, 70, 15, 60.

Look 80, 70 and 60 they are all decreasing by 10.
Whereas 10, 15 is increasing by 5.

So we get the series.

First 10 then we get 15 and then 15+5 comes 20.
It's like taking the alternate numbers (leaving one).

Hope this helps.

First 80, 10 is subracted it comes to 70 then to the previous 10 add 5 then again sub 10 from 70 it comes to 60 then again to the previous 15 add another 5 it comes to 20.

Here he mentioned all the questions and answere

80,10,70,15,60,20,50,25..........

First series;

80 - 70 = 10.
10 + 60 = 70.
70 - 55 = 15.
15 + 45 = 60.
60 - 40 = 20.

And, alternate series;

-70 + 60 = -10.
+60 - 55 = +5.
-55 + 45 = -10.
+45 - 40 = +5 and so on....

Hope this answer clarify all your doubt.

First we see difference each one (80,10,70,15,60).

80-10,10-70, 70-15, 15-60.

70, 60, 55, 45(70-60) (60-55) (55-45).

First increase 10, second decrease 5, third increase 10.

So now decrease 5 (45-5)=40 so answer is 60-40= 20.

Firstly focus on.

80, 70, 60, (series are decreased by number (-10))
10, 15, _? (Series are increased by (+5))

So after the number is;
(10)+5(15)+5(20)<-->
So, 20 is the answer .
The Final answer is;
80, 10, 70, 15, 60, 20........

In this series they have divided numbers into two parts .This series goes like this 80, 10, 70, 15, 60, 20, 50, 25, 40, 30, 30, 35, 20 40, 10, 45 ...

80 70 60 50 -----> Decrement of 10.
10 15 20 25 -----> Increment of 5.