Q&A - PSLE Math

[tianzhu]

Hi


Good Morning.

I’ve a question from a member via PM. It’s about fried noodle and bak chor mee, but I am changing it to fried rice because I only have a photograph of fried rice.

This question is similar to the “Counting heads and legs” type of question but with a tweak. One needs to work in groups of 3 children in this particular case.

Besides GC, you may use “Make a Supposition” or Assumption Method”.

Pretend, Pretend lah,
Start with suppose, assume or pretend all were adults.

Hope this helps.

Best wishes

http://farm8.staticflickr.com/7022/6518324819_548ca9d2dc_z.jpg\">

[elkniwt]

Dear tianzhu and MathIzzzFun,


My sincere appreciation!!! Thank you both very much!

[small]

Brain stuck, please help and TIA..


A car and a loory started at the same time and travelled from Town R to Town S along the same route, When the car arrived in Town S 45 min ealier than the lorry, the lorry had only just travelled 3/5 of the journey. If the averagespped of the lorry was 60 km/h, find the distance between the two towns.

[MathIzzzFun]

small:

Brain stuck, please help and TIA..


A car and a loory started at the same time and travelled from Town R to Town S along the same route, When the car arrived in Town S 45 min ealier than the lorry, the lorry had only just travelled 3/5 of the journey. If the averagespped of the lorry was 60 km/h, find the distance between the two towns.

Hi

The car reached Town S 45 min earlier which also means that the lorry will take another 45 min to reach Town S ... speed of lorry is known, so the distance to Town S can be calculated and this is equal to 2/5 of the journey.. I think you complete the solution

cheers.

[small]

MathIzzzFun:

small:

Brain stuck, please help and TIA..


A car and a lorry started at the same time and travelled from Town R to Town S along the same route, When the car arrived in Town S 45 min ealier than the lorry, the lorry had only just travelled 3/5 of the journey. If the average speed of the lorry was 60 km/h, find the distance between the two towns.

Hi

The car reached Town S 45 min earlier which also means that the lorry will take another 45 min to reach Town S ... speed of lorry is known, so the distance to Town S can be calculated and this is equal to 2/5 of the journey.. I think you complete the solution

cheers.

Hi MathIzzzFun,

Thanks for the solution..

By the way, can you please explain why the lorry will also take another 45 min to reach Town S if the speed of the 2 vehicles not the same?

[tianzhu]

Hi small


Good Morning.

Hope this helps.

Best wishes

http://farm8.staticflickr.com/7146/6578211687_96541f06a3_z.jpg\">

[small]

tianzhu:

Hi small


Good Morning.

Hope this helps.

Best wishes

http://farm8.staticflickr.com/7146/6578211687_96541f06a3_z.jpg\">

lol, my son and I think too much.

Anyway Tianzhu & MathIzzfun, once again many thanks for your help.

[MathIzzzFun]

small:

tianzhu:

Hi small


Good Morning.

Hope this helps.

Best wishes

http://farm8.staticflickr.com/7146/6578211687_96541f06a3_z.jpg\">

lol, my son and I think too much.

Anyway Tianzhu & MathIzzfun, once again many thanks for your help.

u r welcome

cheers!

[Chan09]

Can someone advise on nanyang ca1 Primary 6 maths 2011 question 18 as there seems to be a missing part in the paper?


The total area of triangle A and B is ??? Of the area of triangle c? Thank you

[Neat]

Hi


I would like to know the working for the following question:

1) The ratio of the number of Donovan’s stickers to the number of Hong Yi’s stickers is 10:3. After Donovan gave Hong Yi 1/5 of his stickers, Hong Yi had 30 stickers less than Donovan. How many stickers did Donovan give to Hong Yi?

2) Class A and Class B have the same number of pupils. The ratio of the number of boys in Class A to the number of boys in Class B is 3:2. The ratio of the number of girls in Class A to the number of girls in Class B is 3:5. Find the ratio of the number of boys in Class A to the number of girls in Class B.

By the way, is there any book to recommend on the ratio problems?

Thanks so much for the help.