Derek Yeo's answer to Zee's Primary 5 Maths Whole Numbers Singapore question.

done {{ upvoteCount }} Upvotes
clear {{ downvoteCount * -1 }} Downvotes
Derek Yeo
Derek Yeo's answer
36 answers (Tutor Details)
Hi Zee, hope this helps.
You can draw model for both then you should get 11u + 45 and 15u + 75 for both cases.

After that you can solve for one 1unit which is the cost of a book.
3 months ago
Thank You