Amanda Chang's answer to Nancy low's Secondary 1 Maths Singapore question.
done
{{ upvoteCount }} Upvotes
clear
{{ downvoteCount * -1 }} Downvotes
400 is a square of 20 x 20, so for the multiple of two consecutive pages to be 420, it can be 19 x 20 or 20 x 21
since 420 is bigger than 400, it must be 20 x 21
to check, 400 = 20 x 20, 420 = 400 + 20 = 20 x 21 = (20 x 20) + 20
since 420 is bigger than 400, it must be 20 x 21
to check, 400 = 20 x 20, 420 = 400 + 20 = 20 x 21 = (20 x 20) + 20
Date Posted:
4 years ago
360 Tutoring Program