NG BAN WAH's answer to hamizah's Primary 4 Maths Singapore question.

done {{ upvoteCount }} Upvotes
clear {{ downvoteCount * -1 }} Downvotes
NG BAN WAH
Ng Ban Wah's answer
385 answers (Tutor Details)
1st
For Primary 4, work out the answer by Trial and Error because you have yet to learn how to use equation (algebra).