Question 433445
25,23,19,13,___.. 
<pre>
To get from the 1st term 25 to the 2nd term 23, we must subtract <font color = "red">2</font>.

To get from the 2nd term 23 to the 3rd term 19, we must subtract <font color = "red">4</font>.

To get from the 3rd term 19 to the 4th term 13, we must subtract <font color = "red">6</font>.

Look at those red number that we subtracted each time to get the next term.
Do you see a pattern? 2,4,6,

Don't you think the next number to subtract would be <font color = "red">8</font>?

To get from the 4th term 13 to the 5th term, we must subtract <font color = "red">8</font>, and get 5.

Edwin</pre>