Answer: 104 pages
Step-by-step explanation:
On 1/4 is actually 2/8 so on Monday and Wednesday together she read 3/8 + 2/8 = 5/8 of the 352 pages and 5/8 x 352 = 220.
Tuesday she read 28 pages so she has read 220 + 28 = 248 pages.
She must read 352 -248 = 104 pages more