Let :
T = total pages
R = remaining pages
on Monday she reads 3/8 of the novel, so:
3/8*T = 3/8* 352 = 132 pages.
on Tuesday she reads 28 pages
on Wed she reads 1/4. so:
1/4*T = 1/4 * 352 = 88 pages.
The total pages mathematically would be:
T = 132 + 28 + 88 + R
Remember:
T = total pages = 352
R = remaining pages
So, solving for R:
R = T - 132 - 28 - 88 = 352 - 132 - 28 - 88 = 104 pages
Hence, she needs to read 104 pages in order to finish the novel