## Oct 11, 2009

### PSLE 2009: PSLE Maths - some of the questions

http://psle2009.blogspot.com/2009/10/psle-maths-some-of-questions.html

### PSLE Maths - some of the questions

The above figure is a square. The angle question answer above is 150 degrees. Because the bottom triangle is equilateral triangle. (draw a circular curve through all 3 lines and they become the radii of the incomplete circle otherwise known as the arc)
360 - 60 = 300 degree
300 degree / 4 = 75 degree
75 degree x 2 = 150 degree

6 friends decided to rent computers from 2pm to 4.30pm. While 4 of them were playing, the other two would watch. If the cycle continues, and each of them played for equal number of minutes, how many minutes will each person get to play? Ans: 100 minutes

Mei and Lin were in a bicycle race. Mei was travelling at a constant speed of 20km/hr and they both did not change their speed. When Lin completed half the race, Mei was 3.5km ahead. Mei completed the race at 10.45am. What time did Lin complete the race? Ans: 11.06am