A story book has 60 pages. I read page 127 on the first day. I read 173 the next day, and there are more left.
Does the subject want to ask, "A story book has 600 pages * * *. I read 127 on the first day and 173 on the second day. How many pages are left? " 300 pages. 600-(127+173) = 600-300 = 300 (pages), and the result can be calculated as 300 pages by addition and conversion in mathematics. Additive commutative law: a+b=b+a Addition Law: (a+b)+c=a+(b+c) or (A+B)+C = (A+C)+B.