Arunkumar Pandyan's answer to Lele's Primary 4 Maths Singapore question.

done {{ upvoteCount }} Upvotes
clear {{ downvoteCount * -1 }} Downvotes
Arunkumar Pandyan
Arunkumar Pandyan's answer
17 answers (A Helpful Person)
I hope this helps. It is easy to use algebra than model method. So, I have used algebra.