Thanks MIZF. Understand it’s the LCM of (5,16,28)+4. But what is the working to derive to the answer, which is 564? If it is via trial and error, it will take a long time. Moreover, this is only a 1 mark question.

Hi, need help on the following. Thanks in advance!


When a certain number of marbles in a box is divided equally among 5, 16 or 28 boys, there is a remainder of 4 marbles. What is the minimum number of marbles in the box?

Appreciate anyone’s help on this question:


Mr lee left town M and travelled towards town N at an average speed of 80km/h. An hour later, mr Ong left town M and travelled towards town N at an average speed of 100km/h. Mr Ong passed town Q which was halfway between town M and town N 30 minutes earlier than mr Lee. If mr Ong reached town N at 10 pm , at what time did mr Lee leave town M for town N ?

Thanks!

Hi. Stuck with a question from hokkien huay kuan 2009 Maths preliminary…


A car and a coach travelled from Town A to town B. The coach left town A at 0648 and it took 5 hours to reach town B. The car started 30 minutes later than the coach and it took 4 hours to reach town B. At what time did the car catch up with the coach?

The answer sheet shows 0918 but there is no working…

Thanks!

MathIzzzFun - Thanks!

Hi. Need help with this question:


At first, 25% of Kumar’s money was the same as 33-1/3% of Lily’s money. Lily’s father gave her $80 later, while Kumar spent $325. In the end, Lily has 2-1/2 times as much money as Kumar.
(a) How much money did Kumar have at first?
(b) How much money did Lily have in the end?

Thanks!