Answer:
9 pages she can fill before her vacation.
Step-by-step explanation:
Total pages in album = 30
Fraction of photo album pages which are is full =\(\frac{3}{5}\)
Photo album pages which are is full =\(\frac{3}{5}\times 30 =18\)
Fraction of photo album pages which are empty :x
\(\frac{3}{5}+x=1\) (Sum of all fraction is 1)
\(x=\frac{2}{5}\)
Album pages which are empty =\(30\times \frac{2}{5}=12\)
Fraction of album set aside for vacation photos = \(\frac{1}{4}\) of the photo album pages which are empty
Album pages which are kept for vacation photos:
=\(\frac{1}{4}\times 12= 3\)
Total empty pages left = 30 - 18 - 3 = 9
9 pages she can fill before her vacation.
