ozora:

Thanks to @Ender, Kainetik n linfangjun for the various methods in solving it

You're most welcome!

ozora:

need some guide for the following question.

1) there are more pupils in School A than School B.
30% of the pupils in School A is 45 more than 40% of the pupils in School B. If 10% of the pupils in School A leave to join School B, there will be 200 more pupils in School A than School B. How many pupils are there in School A?

thanks

Hi, here's a step-by-step video solution: http://youtu.be/R3AArQp4EBQ

Cher2101:

Hi parents, I have a few questions I do not understand. Please help


1). Ahmad carried home 3 bags of books. The total number of books in Bags B and C is 9 more than the number of books in Bag A. The total number of books in Bags A and C is 13 more than the number of books in Bag B. Given that Bag A has more books than Bag B, how many books are there in Bag C?

Hi,

B+C = A+9 (1)
B+13 = A+C (2)
(1) - (2):
C-13 = 9-C
2C = 22
C = 11.

Cher2101:

Hi parents, I have a few questions I do not understand. Please help


3). Shop A and shop B had a total of 10400 packets of flour at first. Both shops sold 3/5 of their packets of flour. Shop B then had 520 more packets of flour than shop A.
(a) How many packets of flour did Shop B have at first?
(b) Shop B sold each packet of flour at $2.25. How much did Shop B collect from the sale of the flour?

Hi, for Qn 3), here's a step-by-step, visual solution: http://youtu.be/qo6SRx_BoxI

ttlkbs:

Pls help :


http://i59.tinypic.com/15g2vxh.jpg\">

Hi, for a more visual solution, check out this link: http://youtu.be/oNOoNvw8eMI

anneshirleygilbert:

Thank you, pinkapple. Really appreciate your help.

I have another question from H.O.T. corner. I find questions from this section of the textbook difficult.

Thank you, everyone for all your help.

Sincerely
anne

As for 14(iii), using a quick plot on wolframalpha, we can easily see the shape of the graphs involved:
http://i58.tinypic.com/6okjkh.png\">

anneshirleygilbert:

http://i59.tinypic.com/5esqdi.jpg\">


Thank you, pinkapple. Really appreciate your help.

I have another question from H.O.T. corner. I find questions from this section of the textbook difficult.

Thank you, everyone for all your help.

Sincerely
anne

Hi Anne,

My explanation for part ii :
http://i60.tinypic.com/2lwtbm9.png\">

Jerico:

Hi,


Can someone please help with the following question urgently :-

Q : If a bicycle shop owner offers a discount of 5% off a bicycle's usual selling price, he will earn $85. If a shop owner offers a discount of 20% off its usual selling price, he will lose $20. Find the usual selling price and cost price of the bicycle.

Thank you in advance for your help !

Hi,

Change in discount = 15% --> change in $$ = 85+20 = 105.
1% >> $7
100% >> $700 << Selling price
5% >> $35
Cost price = $700 - $35 - $85 = $580.

COOKIE64:

http://i62.tinypic.com/fz6jqh.jpg\"> Please help

http://i60.tinypic.com/1603if7.jpg\">

COOKIE64:

http://i58.tinypic.com/24yz2j5.jpg\">

Area of unshaded small semi-circle = 4 units
Area of large semi-circle = 4 + 5 = 9 units
Ratio of area of small semi-circle to area of large semi-circle = 4:9

Since area is proportional to the square of radius,

Ratio of radius of circle to radius of large semi-circle = 2:3