On Saturday Lara read 2/5 (2 fifths in fractions) of her book. On Sunday she read the other 90 pages to finish her book. How many pages are in her book?

Question

Answer this question  and explain the answer please.

Answer 1

After reading two fifths of the book, 3/5 of the book remains to be read.

3/5 of x = 90 pages (letting x represent total # of pages).

So x = (5/3) of 90 = 150 pages.