Kelly can read five pages of her fiction book or two pages of her history textbook in seven minutes. If Kelly wants to read thirty pages of each book, for how many minutes in total must Kelly read?

So five pages of her fiction book in 7 minutes. And she must read thirty pages:

30/5 = 6.

6 * 7 = 42 minutes for the fiction book.

So 2 pages of her history book in seven minutes.

30/2 = 15.

15 * 7 = 105 minutes for the history textbook

Add:

42 + 105 = 147 minutes.

452,489 to the nearest thousand is 452,000

just sum

10 + 10 = 20