Q&A - P3 Math

[ChiefKiasu]

mama_10:

davos:

Let the width be 1 unit, the length 3 units, The length is longer than the width by 2 units.

If the width is increased by 80cm, length is decreased by 200cm,
80 + 200=280--->2 units,
thus 1 unit is 280/2 =140.
Width is 140cm, length is 140 x 3 = 420cm.

Im using the method below to find out the answer :-
3x-200=x+80
2x=280
x=140
L=3x=420cm
Can you explain why 80+200-->2 units?

Thanks

80+200 represents the total difference in length between the current length and breadth of the rectangle.
Since length = u + u + u and width = u, the difference in length is 2u.
So 2u = 80+200

[mama_10]

ChiefKiasu:

mama_10:

[quote=\"davos\"]Let the width be 1 unit, the length 3 units, The length is longer than the width by 2 units.

If the width is increased by 80cm, length is decreased by 200cm,
80 + 200=280--->2 units,
thus 1 unit is 280/2 =140.
Width is 140cm, length is 140 x 3 = 420cm.

Im using the method below to find out the answer :-
3x-200=x+80
2x=280
x=140
L=3x=420cm
Can you explain why 80+200-->2 units?

Thanks

80+200 represents the total difference in length between the current length and breadth of the rectangle.
Since length = u + u + u and width = u, the difference in length is 2u.
So 2u = 80+200[/quote]
:thankyou:

[mama_10]

Im using the method below to find out the answer :-

3x-200=x+80
2x=280
x=140
L=3x=420cm
Can you explain why 80+200-->2 units?

Thanks[/quote]

80+200 represents the total difference in length between the current length and breadth of the rectangle.
Since length = u + u + u and width = u, the difference in length is 2u.
So 2u = 80+200[/quote]


:thankyou:[/quote]

What does the dimension refer to ? The question was asking what are the dimension of the rectangler table?
Thanks!

[davos]

Dimension refers to the length and width of the rectangular table in this case.

[concerned1970]

Pls help to solve the following ques.


1) The difference between 2 numbers is 60. The greater number is 3 times the smaller number. Find the greater number.

2) What number am I thinking of?
2/3 of this number is 100.
2/5 of this number is 60.
The number is _____.

[corneyAmber]

concerned1970:

Pls help to solve the following ques.


1) The difference between 2 numbers is 60. The greater number is 3 times the smaller number. Find the greater number.

2) What number am I thinking of?
2/3 of this number is 100.
2/5 of this number is 60.
The number is _____.

1. using models,
smaller number = u
bigger number =3u
3u-u = 60
2u = 60
u = 30
Bigger number = 3u = 3*30 =90

2. 2/3 u = 100
u = 100*300/2 = 300/2 = 150
2/5u = 60
u = 60*5/2 = 300/2 = 150
Hence the number is 150.

[concerned1970]

Tysm for yr help Ksi!

[corneyAmber]

concerned1970:

Tysm for yr help Ksi!

You are :welcome:

[mama_10]

Urgent!Please help! P4 Mathematics questions.


How many times does the digit 9 appear in a 100-page book?

:?: :thankyou:

[mama_10]

Please help! P4 Mathematics questions.


How many times does the digit 9 appear in a 100-page book?

Thanks