Hello, my tuitee got 231 for his psle. He wants to go to Kranji sec but the cop is 232. Should he try?


Thank you for reading!

jon00:

Ann and Betty had the same number of bookmarks.

After Ann had given away 120 bookmarks, Betty had 4 times as many bookmarks as Ann.
How many bookmarks did both of them have at first?
How to draw the model to get the answer?
Thanks in advance.

Happy New Year! First thing to note for this kind of problem sum is The number of bookmarks for Betty remained unchanged. We need to use the before and after approach for this sum.

BEFORE
A [__________]
B [__________]
AFTER
A [_]<--120-->
B [_][_][_][_]

Since both of them have equal number of bookmarks at first,
3u-> 120
1u-> 120/3=40
Ann has 40+120=160
Total = 160*2= 320(done)

Hello parents and friends, I visited popular and the staff recommended me this book by Pang Yian, http://maths-digest.com/new/index.php?_a=viewProd&productId=11

She says that volume B and D are important for p6 students. Any advise on this? Thanks!