Q&A - P3 Math

[Thein]

http://i50.tinypic.com/5vr7k9.jpg\">

[SAHM Chew]

AgonyMum:

Hi, what is the correct method to use to solve this question.This is a P3 question. Please advise. Thanks in advance.


Qn1) For every $35 spent at a mall, a discount of $5 is given. Jane paid $360 for a sofa after the discount was given. What is the original price of the sofa? Mr Lim paid $500 for a TV after the discount was given. What is the original price of the TV?

Both parts are similar. Problem is I don't know which method to use to make my P3 child understand.

I do not know any method, so i can only use guess and check

$35 spend, $5 discount
$420 spend $60 discount

$420 - $60 = $360

Original price of the sofa is $420.

[AgonyMum]

Hi SAHM Chew,

Thanks for your input
Anyone know of any other method that can be used for this type of questions?

[MathIzzzFun]

SAHM Chew:

AgonyMum:

Hi, what is the correct method to use to solve this question.This is a P3 question. Please advise. Thanks in advance.


Qn1) For every $35 spent at a mall, a discount of $5 is given. Jane paid $360 for a sofa after the discount was given. What is the original price of the sofa? Mr Lim paid $500 for a TV after the discount was given. What is the original price of the TV?

Both parts are similar. Problem is I don't know which method to use to make my P3 child understand.

I do not know any method, so i can only use guess and check

$35 spend, $5 discount
$420 spend $60 discount

$420 - $60 = $360

Original price of the sofa is $420.

Hi

for every $35, $5 discount --> discounted price = $30
Discounted price paid = $360
$360/$30 = 12 --> 12 x $5 = $60 was given
original price = $360 + $60 = $420

Discounted price for TV = $500
$500/$30 = 16R20 --> 16 x $5 = $80 discount was given
original price = $500 + $80 = $580

cheers.

[AgonyMum]

Hi MathIzzzFun,

Thank you very much!
I understood your working.I hope my child can understand too
:thankyou:

[SAHM Chew]

i have a question that is from the previous page… but could not work out the ans…


Ann spent $5850 on some bags and wallets. She bought 5 times as many bags as wallets. She paid $4400 more for bags than wallets. Each bag cost $60 more than a wallet. Find the cost of one wallet.

Thanks

[Thein]

http://i46.tinypic.com/etsgf5.jpg\">

[MathIzzzFun]

SAHM Chew:

i have a question that is from the previous page..... but could not work out the ans...


Ann spent $5850 on some bags and wallets. She bought 5 times as many bags as wallets. She paid $4400 more for bags than wallets. Each bag cost $60 more than a wallet. Find the cost of one wallet.

Thanks

Hi

amount spent on Bags --> $(5850+4400)÷2 = $5125
amount spent on Wallets --> $5850 - $5125 = $725
Ann bought 5 times as many bags as wallets
Number of bags : Number of wallets --> 5 units : 1 unit
So, amount for 1 unit of bags --> $5125 ÷ 5 = $1025
$1025 - $725 = $300 (difference in cost of 1 unit of bags vs 1 unit of wallets)
$300 ÷ $ 60 = 5

Number of wallets bought --> 1 unit = 5
Cost of 1 wallet = $ 725 / 5 = $145

cheers.

[peapot]

Please help me on this fraction q.


In the class, 2/5 of the students like table tennis, 1/3 of the students like basketball and the rest like volleyball.

a) What fraction of the class like volleyball?
b) Given that 6 more students like table tennis than volleyball, find the number of students in the class.

I know how to work out part a) but I m not sure about part b.

[PiggyLalala]

peapot:

Please help me on this fraction q.


In the class, 2/5 of the students like table tennis, 1/3 of the students like basketball and the rest like volleyball.

a) What fraction of the class like volleyball?
b) Given that 6 more students like table tennis than volleyball, find the number of students in the class.

I know how to work out part a) but I m not sure about part b.

Change the fraction to common denominator.
B) 2/5 = 6/15 ----table tennis
1/3 = 5/15 -----basket ball
1- 5/15 - 6/15 = 4/15 volleyball
Therefore table tennis - 6 units
Volleyball - 4 units
2 units - 6
1unit - 3
15 units -3x 15 =45pupils in the class