Hi, just wondering if someone would be able to shed some light as to the various sec 3 subject combinations available in TKGS?


Thank you very much.

Thanks, Jieheng.

At an electronic shop, Tyler, the boss, wanted to sell a camera. If he had sold it at a discount of 35%, James would incur a loss of $120. If he had sold it at a discount of 15%, he would earn an extra $80. If he wanted to sell his camera for $850, how much extra would he earn?


This question is from Get Me Thinking. I’ve looked at the answer & workings the book provided but still could not understand.

Please could someone help.

Thank you very much.

Need help on this Q please:


Mr Chua has a class of less than 40 pupils. He gave all the pupils in his class some jellybeans. If he gave 5 jellybeans to each pupil, he would have 2 jellybeans left. If he gave 4 jellybeans to each pupil, he would have 38 jellybeans left.

(a) How many pupils were there in his class?
(b) How many jellybeans did Mr Chua have?

Thank you very much.

Thanks MathIzzzFun, it’s legible but sorry still could not see the relationship of the 1 unit being 24 km. Also, what’s the significance of the 1 unit?

Thanks oldschool for the lead. The materials are informative indeed.


MathIzzzFun, re Ann and Ben question, may I know how you derived 1 unit ~ 24km?

Thanks a lot MathIzzzFun and SpeedMaths (still up at 1:54am!!! Phew …)

Will show them to my daughter tonight and see if she is able to relate.

The other two questions:

Q4. Jeremy walks to school at an average speed of 4 km/h everyday. One day, after walking a distance of 1 km, he realised that his watch was slow. So he ran at a constant speed and managed to reach school just on time. Later, he calculated that if he had run at this speed right from the start of the journey, he would have reached school 5 minutes earlier. What was his running speed?

Q5. Mr Tan took 6 hours to travel from Town A to Town B. Mr Lim took 4 hours to travel from Town B to Town A. If both of them started travelling at 10 am, at what time did they pass each other?

Thank you.

Hi, could someone help me with these questions please. Daughter’s tearing her hair out over them:


1. Mohan drove from Town A towards Town B at 9.50am. Half an hour later, Nora left Town B for Town A. Both of them reached their respective destinations at 10.50am. If Nora travelled at 20km/h faster than Mohan, find the speed of Nora.

2. Abel and Cain cycled from City Mall to East Mall at 11 km/h and 8 km/h respectively. Abel left City Mall an hour later than Cain. He arrived at East Mall 30 minutes earlier than Cain. How long did Abel take?

3. Ann left Town A for Town B. At the same time, Ben left Town B for Town A. Ann drove at an average speed of 72 km/hr while Ben drove at 56 km/h. Ann and Ben passed each other at a point 24 km from the mid point of Towns A and B. What is the distance between A and B?

I have 2 more but my eyelids are too heavy now to go on.

Thank you very much.

Thanks Tianzhu but i just need to understand why Wee Teck is given 3 units because the question says Robert paid 1/3 of the amount paid by Henry AND Wee Teck. By using 3 units to represent Wee Teck, we would be assuming that both Wee Teck and Henry paid equal amount which might mot be the case.


Your thoughts?

Hi, I’m back again for support:


Henry, Robert and Wee Teck bought a present for their friend. Robert paid 1/3 of the amount paid by Henry and Wee Teck. Henry and Robert paid 2/3 of the amount paid by Wee Teck. Given that Wee Teck paid $27 more than Henry, how much did the present cost?

Thank you very much.