Answer:
15 + 1.2x = 2.4x
13 pages
Detailed explanation:
Let x denote the number of pages Christopher needs to create.
Since currently, completing one page takes 2.4 hours,
the total current time is 2.4x hours.
With the new software,
there is an initial learning time of 15 hours,
and each page takes 1.2 hours,
so the total time with the new program is 15 + 1.2x.
Setting the new time equal to the old time,
15 + 1.2x = 2.4x
This is the equation needed.
Subtracting 15 from both sides:
1.2x = 2.4x - 15
Subtracting 2.4x from both sides yields:
-1.2x = -15
Dividing both sides by -1.2:
x = 12.5, which approximates to 13.
Therefore, Christopher must create at least 13 pages.