Q&A - PSLE Math

[Oldschool]

Mary Joy:

hi everyone,


I have a speed problem sum to solve.Please help me.

1.Henry took 4h to travel from A to B.Daniel took 6h to travel from B to A.When they meet,they were 1.2 km away from the midpoint.How far is the distance between A to B?

:thankyou: :lovesite:

Hi,

Speed Ratio,
H : D
6U : 4U

At time t, they met so

6Ut + 4Ut = AB
10Ut = AB, and

6Ut - 4Ut = 2.4
2Ut = 2.4
10Ut = 12km = AB

Regards

[NYPSkiasuparent]

Joey has some red and blue beads.

If she buys another 15 red beads, the percentage of the red beads she has become 30%.
If she gives away 20 blue beads, the percentage of the blue beads she has becomes 76%.
However many red beads and blue beads do Joey have?

[Mary Joy]

Oldschool:

Mary Joy:

hi everyone,


I have a speed problem sum to solve.Please help me.

1.Henry took 4h to travel from A to B.Daniel took 6h to travel from B to A.When they meet,they were 1.2 km away from the midpoint.How far is the distance between A to B?

:thankyou: :lovesite:

Hi,

Speed Ratio,
H : D
6U : 4U

At time t, they met so

6Ut + 4Ut = AB
10Ut = AB, and

6Ut - 4Ut = 2.4
2Ut = 2.4
10Ut = 12km = AB

Regards

thank you for your detailed explanation
:thankyou:

[Oldschool]

NYPSkiasuparent:

Joey has some red and blue beads.

If she buys another 15 red beads, the percentage of the red beads she has become 30%.
If she gives away 20 blue beads, the percentage of the blue beads she has becomes 76%.
However many red beads and blue beads do Joey have?

Hi

http://www.kiasuparents.com/kiasu/forum/viewtopic.php?p=997662#p997662

Regards

[ngl2010]

May I know how you search whether a question has been posted before?

[Oldschool]

ngl2010:

May I know how you search whether a question has been posted before?

Hi,

Just scroll up and just beneath the \"contact us\" you will see a small magnifying glass - Search\" function.

Regards

[ngl2010]

Oldschool:

ngl2010:

May I know how you search whether a question has been posted before?

Hi,

Just scroll up and just beneath the \"contact us\" you will see a small magnifying glass - Search\" function.

Regards

Thank you.
:thankyou:

[elishatan]

Thank you all for your replies. I really appreciate it!

[MathIzzzFun]

using :

sum of angles around a point = 360° &
sum of interior angles of a triangle = 180°

http://i43.tinypic.com/72f7y9.png\">

cheers.

[fullhope]

Hi , can anyone help the following question?

Every Saturday, John will go for his usual exercise. If he runs up 32 steps and walks up 68 steps , he will take 184 seconds. If he runs up 50 steps and walks up 50 steps, he will take 175 seconds, if he runs up the same rate throughout the whole exercise, how long will he take to run the 100 steps?

Thank you in advance