Q&A - P5 Math

[YumYum]

Hi, can someone pls help with this Qn:


Aaron and Ben shared a sum of $200. Aaron gave 3/5 of what he has to Ben. Ben later gave 1/5 of what he has back to Aaron. They ended up with equal amount of money. How much did Aaron have at first? Thanks.

[verykiasumummy]

YumYum:

Hi, can someone pls help with this Qn:


Aaron and Ben shared a sum of $200. Aaron gave 3/5 of what he has to Ben. Ben later gave 1/5 of what he has back to Aaron. They ended up with equal amount of money. How much did Aaron have at first? Thanks.

hi, offering my help :

i would use working backwards method.. note that this is internal transfer and constant total.

They ended up with equal amount of money.
so $200 / 2 = $100

Ben later gave 1/5 of what he has back to Aaron.
means Ben would have 4/5 left and this 4/5 is $100.
4/5 --> $100
1/5 --> $25 (Ben gave back to Aaron)
5/5 --> $125 (Ben has $125 after Aaron gave him 3/5 of his money)

$200 - $125 = $75 (Since Ben has $125 after receiving money from Aaron, Aaron should have $75 left after giving his money to Ben.)

Aaron gave 3/5 of what he has to Ben.
so Aaron should have 2/5 of money left.
2/5 --> $75
1/5 --> $37.50
5/5 --> $187.50 (Aaron had at first)

$200 - $187.50 = $12.50 (Ben had at first)

[YumYum]

Verykiasummummy: thanks!

[verykiasumummy]

YumYum:

Verykiasummummy: thanks!

welcome...

[YumYum]

Hi, can anyone pls helpt with this Qn? thanks! http://i48.tinypic.com/10yfg2p.jpg\">

[MathIzzzFun]

YumYum:

Hi, can anyone pls helpt with this Qn? thanks! http://i48.tinypic.com/10yfg2p.jpg\">

Volume of air = 12 x 448 cm3

In figure 2, volume of water : volume of air = 3 : 5
So volume of water = 3/5 x 12 x 448 = 3225. 6 cm3

cheers

[YumYum]

MathIzzzFun, thanks, you make it look so easy but it’s so hard for those who can’t "see" the method… Thks

[Fattybombom]

:? Hi Mathlzzfun,


Sorry, I still can't get it! Why did u use 3/5 instead of 3/8. Can explain again!
Thanks

[mathnoobs]

MathIzzzFun:

YumYum:

Hi, can anyone pls helpt with this Qn? thanks! http://i48.tinypic.com/10yfg2p.jpg\">

Volume of air = 12 x 448 cm3

In figure 2, volume of water : volume of air = 3 : 5
So volume of water = 3/5 x 12 x 448 = 3225. 6 cm3

cheers

can we calculate the volume of water as (Height of water) x Area of tank = 10 x 448 = 4480 cm3 ?

[mathnoobs]

mathnoobs:

MathIzzzFun:

[quote=\"YumYum\"]Hi, can anyone pls helpt with this Qn? thanks! http://i48.tinypic.com/10yfg2p.jpg\">

Volume of air = 12 x 448 cm3

In figure 2, volume of water : volume of air = 3 : 5
So volume of water = 3/5 x 12 x 448 = 3225. 6 cm3

cheers

can we calculate the volume of water as (Height of water) x Area of tank = 10 x 448 = 4480 cm3 ?[/quote]never mind, forgot about the 8 identical blocks.