breakfast rebate

if l may ,,it all started when l did my anything l should know with the kids this mornings (as they know l will tickle to get the information :) )find out the boy 11yo is in the mathematical olympiads so there a bit fuss made blu blu .This is a big contest schools put in teams and they are tring to get a good score ,its like a footy team thing ,kid want to make the team and our shows that don"t give up on the public system our school ranks up there with the bigger schools

debate starts now
question 1-D
A rectangle has a perimeter of 90cm .the length of the rectangle is 25 cm
more than the width

find the of sq cm in the area of the rectangle

you have 6 Minutes:roll:

20cm?

is that your answer 20cm sq

10cm x 35cm gives an area of 350cm2

I will put it to my year 6/7 maths class this morning and see how long it takes.

20cm wide....

500sq cm (Not good at this calc)

Quote:

---

Originally Posted by Burnsy

10cm x 35cm gives an area of 350cm2

I will put it to my year 6/7 maths class this morning and see how long it takes.

---

no im with Gra 500 sq
25 top 20 sides =500 sq
90=2x25+ (x+x)x=20

What is happening here boys. :D

The number of prime numbers is infinite. Prove it :D

Don't take me seriously. :D

Quote:

---

Originally Posted by Wongo

What is happening here boys. :D

---

come on wongo you are smart man you tell them that l am right

10cm X 35cm = 350 cm^2

I am with burnsy - area is 350 sq cm

Calculation is Length = width + 25
2W + 2 W + 50 = 90 (perimeter)
4W = 40
W = 10
L = 10 + 25 = 35
Area is L x W = 10 x 35 = 350

Here endeth the maths lesson

Don’t bother guys. These things are always won by the Chinese. :D

Where did 10 x 35 come from....????

The question was perimiter = 90cm
and the length was 25cm....


from this two lenths of 25cm's = 50 cm
Perimiter - two lengths = twice width
90 - 50cm = 40cm
so width = 40cm/2

So rectangle = 20cm X 25cm...

Length x Width = Area
20cm X 25cm = 500Sq cm

Quote:

---

Originally Posted by SPIRIT

no im with Gra 500 sq
25 top 20 sides =500 sq
90=2x25+ (x+x)x=20

---

Quote:

---

Originally Posted by Gra

Where did 10 x 35 come from....????

The question was perimiter = 90cm
and the length was 25cm....


from this two lenths of 25cm's = 50 cm
Perimiter - two lengths = twice width
90 - 50cm = 40cm
so width = 40cm/2

So rectangle = 20cm X 25cm...

Length x Width = Area
20cm X 25cm = 500Sq cm

---

You have both done what most 11 and 12 year olds do - not read the question:wink:

Length is 25cm MORE than the o

no 90-50 =40 and you make rectangle once you cut it in half to back e/lenths l have made rectangle yes we know the question says the length is 25 so that 50 ok your left with 40 half that 20 20 x 25 =500