Tutor MathsGuru: Ask me for your burning Maths questions!

[yapperz2000]

http://i50.tinypic.com/302t8ol.jpg\">

Hi!
I need help with this question.
Couldn't find the solution as it was catholic high prelims maths 2008
:udaman:

[MathIzzzFun]

yapperz2000:

http://i50.tinypic.com/302t8ol.jpg\">

Hi!
I need help with this question.
Couldn't find the solution as it was catholic high prelims maths 2008
:udaman:

Hi
The units should be in square meters..

basically, you need to find two square numbers with a difference of 32 - listing the square numbers and using guess and check, for primary school students.

Square numbers : 1, 4, 9, 16, 25, 36, 49...
The two square numbers 4 & 36 gives a difference of 32 -
6x6 - 2x2 = 32

so, area of garden = 4m² -- a miniature garden !!!


cheers.

[petals73]

OMG. 2008 perlim? It came out in my girl P3 SA2 problem sum last yr!!! Can’t remember if she’s got it correct?

[sylpha]

MathIzzzFun:

ppspbubble:

Rick sold a total of 90 chickens and ducks. He earned a total of $4 in every duck he sold and lost $2 on every chicken he sold. On the whole, he earned a total of $222. How many ducks and chickens did he sell?

Hi

number of chickens = [(90x4)-222]/6 = 23
number of ducks = 90 - 23 = 67

cheers.

Hi there
Btw, how would this be illustrated in the model method? I sort of understand the logic I cant graphically \"draw\" it.

[MathIzzzFun]

sylpha:

MathIzzzFun:

Rick sold a total of 90 chickens and ducks. He earned a total of $4 in every duck he sold and lost $2 on every chicken he sold. On the whole, he earned a total of $222. How many ducks and chickens did he sell?


Hi

number of chickens = [(90x4)-222]/6 = 23
number of ducks = 90 - 23 = 67

cheers.

Hi there
Btw, how would this be illustrated in the model method? I sort of understand the logic I cant graphically \"draw\" it.

some examples here -
http://www.flickr.com/photos/62167097@N02/6963704884/in/set-72157629901522689

http://www.flickr.com/photos/62167097@N02/6808896113/in/set-72157629901522689

http://www.flickr.com/photos/62167097@N02/7634466300/in/set-72157629901522689

http://www.flickr.com/photos/62167097@N02/7319052572/in/photostream

cheers.

[sylpha]

MathIzzzFun:

sylpha:

[quote=\"MathIzzzFun\"]Rick sold a total of 90 chickens and ducks. He earned a total of $4 in every duck he sold and lost $2 on every chicken he sold. On the whole, he earned a total of $222. How many ducks and chickens did he sell?


Hi

number of chickens = [(90x4)-222]/6 = 23
number of ducks = 90 - 23 = 67

cheers.

Hi there
Btw, how would this be illustrated in the model method? I sort of understand the logic I cant graphically \"draw\" it.

some examples here -
http://www.flickr.com/photos/62167097@N02/6963704884/in/set-72157629901522689

http://www.flickr.com/photos/62167097@N02/6808896113/in/set-72157629901522689

http://www.flickr.com/photos/62167097@N02/7634466300/in/set-72157629901522689

http://www.flickr.com/photos/62167097@N02/7319052572/in/photostream

cheers.[/quote]Many thanks for the awsome solutions! :salute:

My logic: I managed to piece together the \"logic\" using your graph. Basically, if I had to throw out a duck (90 ducks, max value $360) for 1 darn chicken, it would mean I would lose $6. so thats why $138/$6 => 23 chickens!

[MathIzzzFun]

sylpha:

MathIzzzFun:

[quote=\"sylpha\"]Rick sold a total of 90 chickens and ducks. He earned a total of $4 in every duck he sold and lost $2 on every chicken he sold. On the whole, he earned a total of $222. How many ducks and chickens did he sell?


Hi

number of chickens = [(90x4)-222]/6 = 23
number of ducks = 90 - 23 = 67

cheers.

Hi there
Btw, how would this be illustrated in the model method? I sort of understand the logic I cant graphically \"draw\" it.

some examples here -
http://www.flickr.com/photos/62167097@N02/6963704884/in/set-72157629901522689

http://www.flickr.com/photos/62167097@N02/6808896113/in/set-72157629901522689

http://www.flickr.com/photos/62167097@N02/7634466300/in/set-72157629901522689

http://www.flickr.com/photos/62167097@N02/7319052572/in/photostream

cheers.

Many thanks for the awsome solutions! :salute:

My logic: I managed to piece together the \"logic\" using your graph. Basically, if I had to throw out a duck (90 ducks, max value $360) for 1 darn chicken, it would mean I would lose $6. so thats why $138/$6 => 23 chickens![/quote]yep, that's right.

cheers.

[kwcllf]

Hi please help



When k patners l, they take 8 days to paint a house. When b patners h, they take 6 days to paint the house. When h patners m, they take 12 days to paint a house. How many days do k and m take to paint the house together?

Thanks

[kwcllf]

Sorry, first sentence should be when k patners b, they take 8 days to paint the house.

[MathIzzzFun]

kwcllf:

Hi please help



When k patners b, they take 8 days to paint a house. When b patners h, they take 6 days to paint the house. When h patners m, they take 12 days to paint a house. How many days do k and m take to paint the house together?

Thanks

Total work required to paint a house --> 120 units
K+B --> 120 units/8 days = 15 units/day
B+H --> 120 units/ 6 days --> 20 units/day
H+M --> 120 units/12 days --> 10 units/day
K+B+B+H+H+M --> 45 units/day
K+M --> 5 units/day (B+H --> 20 units/day)
120 units --> 120/5 = 24 days

K+M will take 24 days to paint the house.

cheers.