Jamey says she only has 30% of her book to go before she finishes it. she has read 147 pages so far

how long is jamey book

Let's just change your problem to 147 of 30%

"Of" is always equaling to multiplication (*)

Now, it would be easier to simplify

30% (147)

30% : 100 = 0.3

0.3 (147)

Now, we get to your answer which might be 44.1