Q&A - P4 Math

[The Right Equation]

milo-cupcake:

Can anyone help with the following question?


http://i40.tinypic.com/333z4v4.jpg\">

Thanks in advance.

concepts involved:
1) total quantity remains unchanged
2) work backwards

method 1:
http://i44.tinypic.com/35koqi8.jpg\">

method 2:
http://i39.tinypic.com/fn45q8.jpg\">

method 2 is for explanation purposes (since if it is a p4 qn, not allowed to use ratio)

[milo-cupcake]

The Right Equation:

milo-cupcake:

Can anyone help with the following question?


http://i40.tinypic.com/333z4v4.jpg\">

Thanks in advance.

concepts involved:
1) total quantity remains unchanged
2) work backwards

method 1:
http://i44.tinypic.com/35koqi8.jpg\">

method 2:
http://i39.tinypic.com/fn45q8.jpg\">

method 2 is for explanation purposes (since if it is a p4 qn, not allowed to use ratio)

:thankyou: The Right Equation

[peapot]

pls help me with this.

[peapot]

http://i39.tinypic.com/f0805.jpg\">

[Funz]

peapot:

http://i39.tinypic.com/f0805.jpg\">

is the ans 36cm & 16cm sq?

[peapot]

I don’t know. It’s school homework which she needs to submit on Monday. I don’t have the answer. Pls advise.

[captainavenger]

Hi everyone,could help me :


1) A pendulums swings to and fro in 1 seconds. It makes angle of 53 degrees. How many degrees does the pendulum swing in 5 seconds.


thank you in advance for the input :?

[Funz]

I try.


PS is 1/6 of PQRS which is the perimeter. So perimeter will be 6/6

PS = QR = 1/6

So PQ = SR = 2/6

PQ - PS = 2/6 - 1/6 = 1/6 = 6cm

So PQRS is 6x6cm = 36 cm

PS = 6cm, PQ = 12 cm
Area of rectangle is 6x12 = 72cm sq
Shaded area = 56cm sq
so unshaded area = 72 - 56 = 16cm sq

[tankee]

5 x 2 x 53 = 530 degrees

[peapot]

Oh I c! Now I understand. Thks so much!!