Q&A - P3 Math

[J and J]

ksi:

blue-march:

Hi Parents, pls help:


The total mass of 3 cans of orange juice and 1 bag of potato chips is 1kg 200g.

If each can of orange juice is 120g lighter than each packet of potato chips, what is the mass of 1 packet of potato chips?

thank you!

Is 1 bag of potato chips the same as 1 packet of potato chips?

If not, is there information on 1 bag of PC has how many packets inside? Otherwise it cannot be solved.

1 bag of potato => 1 u
1 can of orange juice => (1u - 120)g
3 can of orange juice => (3u-360)g
3 can of orange juice + 1 bag of potato = 1200g
3u -360 +1u = 1200
4u -360 = 1200
4u = 1560
1u=390
So 1 bag of potato is 390g

[blue-march]

:thankyou:

[blue-march]

by the way, could this be solved by using model?

[Thein]

The total mass of 3 cans of orange juice and 1 bag of potato chips is 1kg 200g.


If each can of orange juice is 120g lighter than each packet of potato chips, what is the mass of 1 packet of potato chips?
potato chips -----> u + 120
orange juice -----> 3u

u+120 + 3u = 1200

4u = 1080

u = 270
Mass of orange juice 270g

mass of 1 bag of potato chips = 270+120 =390 g

check:
3 x 270 = 810
270 + 120 = 390

810+390 = 1200

[corneyAmber]

blue-march:

by the way, could this be solved by using model?

You draw a box for (u) and 3 boxes for (u-120) and then curly bracket all boxes to be equal to 1200.

[SAHM Chew]

Sorry, i do not understand this part

amount spent on Bags --> $(5850+4400)÷2 = $5125

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 - $705 = $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.

[MathIzzzFun]

SAHM Chew:

Sorry, i do not understand this part

amount spent on Bags --> $(5850+4400)÷2 = $5125

MathIzzzFun:

Hi

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.

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.

Hi

hope this helps..

http://i46.tinypic.com/nwwv9u.png\">

cheers.

[peapot]

Sorry, now my turn. I don’t understand where $705 come from.



$1025 - $705 = $300 (difference in cost of 1 unit of bags vs 1 unit of wallets)
$300 ÷ $ 60 = 5

[MathIzzzFun]

peapot:

Sorry, now my turn. I don't understand where $705 come from.



$1025 - $705 = $300 (difference in cost of 1 unit of bags vs 1 unit of wallets)
$300 ÷ $ 60 = 5

oops.. typo.. should be $725
$ 1025 - $ 725 = $ 300

cheers.

[peapot]

heng ah!! I thought why so hard to figure out, I thought my brain cells are dead…