Q&A - P5 Math

[carol73]

hi


pls help

There were 1408 chinese and malay story books in a library. When the librarian bought 73 chinese books and 59 malay books, there were as many chinese books as malay books in the library. how many malay books were there at first?

[carol73]

ariel has a rectangle cardboard that measures 19cm by 15cm. she wants to cut out as many rectangular pieces as she can from it. each small rect piece measures 5cm by 3cm. what is the most number of small rect pieces she can get?

[ChewingPencilLine]

carol73:

ariel has a rectangle cardboard that measures 19cm by 15cm. she wants to cut out as many rectangular pieces as she can from it. each small rect piece measures 5cm by 3cm. what is the most number of small rect pieces she can get?

depending on how you orientate the rectangles, it can be

EITHER

19cm / 5cm = 3 R 4cm
15cm / 3cm = 5

number of small rectangular pieces obtained = 3 x 5 = 15

OR

19cm / 3cm = 6 R 1cm
15cm / 5cm = 3

number of small rectangular pieces obtained = 6 x 3 = 18

The latter obviously yields more rectangular pieces. Therefore, the maximum number of small rectangular pieces obtainable is hence 18.

[ChewingPencilLine]

carol73:

hi


pls help

There were 1408 chinese and malay story books in a library. When the librarian bought 73 chinese books and 59 malay books, there were as many chinese books as malay books in the library. how many malay books were there at first?

I think you are missing a word there... ?

However, a simple way to do it would be to calculate the total number of books in the end and work from there i.e.

1408 + 73 + 59 = 1540 books in the end

Assuming thrice as many Chinese books as Malay books in the end,
4 units: 1540
1 unit: 1540 / 4 = 385
Therefore, number of Malay books in the end is 385.
Number of Malay books at first = 385 - 59 = 326

ADD-ON [EDIT]:

HAHA, SO SORRY, OMG. I assumed that a word was missing out of reflex. I just realized that MathIzzFun is probably right in taking your question to mean what it actually does mean, ._. I have no idea why I did not accept the question as it was. Strange. Sorry!

[tianzhu]

carol73:

hi


pls help

There were 1408 chinese and malay story books in a library. When the librarian bought 73 chinese books and 59 malay books, there were as many chinese books as malay books in the library. how many malay books were there at first?

Hi

In the end, there are 1408 + 73 + 59 ----- 1540 books

Number of Chinese books ------ Number of Malay books ------ 770

Number of Chinese books @first ------ 770 – 73 ------ 697

Number of Malay books@first ------- 711

Best wishes

[carol73]

thanks



There were 1408 chinese and malay story books in a library
this statement is misleading, we thought it was at the end

tianzhu:

carol73:

hi

pls help

There were 1408 chinese and malay story books in a library. When the librarian bought 73 chinese books and 59 malay books, there were as many chinese books as malay books in the library. how many malay books were there at first?

Hi

In the end, there are 1408 + 73 + 59 ----- 1540 books

Number of Chinese books ------ Number of Malay books ------ 770

Number of Chinese books @first ------ 770 – 73 ------ 697

Number of Malay books@first ------- 711

Best wishes

[MathIzzzFun]

ChewingPencilLine:

carol73:

ariel has a rectangle cardboard that measures 19cm by 15cm. she wants to cut out as many rectangular pieces as she can from it. each small rect piece measures 5cm by 3cm. what is the most number of small rect pieces she can get?

depending on how you orientate the rectangles, it can be

EITHER

19cm / 5cm = 3 R 4cm
15cm / 3cm = 5

number of small rectangular pieces obtained = 3 x 5 = 15

OR

19cm / 3cm = 6 R 1cm
15cm / 5cm = 3

number of small rectangular pieces obtained = 6 x 3 = 18

The latter obviously yields more rectangular pieces. Therefore, the maximum number of small rectangular pieces obtainable is hence 18.

http://i42.tinypic.com/13ykqhh.png\">

cheers.

[ChewingPencilLine]

MathIzzzFun:

ChewingPencilLine:

[quote=\"carol73\"]ariel has a rectangle cardboard that measures 19cm by 15cm. she wants to cut out as many rectangular pieces as she can from it. each small rect piece measures 5cm by 3cm. what is the most number of small rect pieces she can get?

depending on how you orientate the rectangles, it can be

EITHER

19cm / 5cm = 3 R 4cm
15cm / 3cm = 5

number of small rectangular pieces obtained = 3 x 5 = 15

OR

19cm / 3cm = 6 R 1cm
15cm / 5cm = 3

number of small rectangular pieces obtained = 6 x 3 = 18

The latter obviously yields more rectangular pieces. Therefore, the maximum number of small rectangular pieces obtainable is hence 18.

http://i42.tinypic.com/13ykqhh.png\">

cheers.[/quote]Thanks for the correction. I did think of this but presumed that they will not be expected to do it this way... Since it is at primary level. Realized from experience that sometimes, this is not required in the answers for certain assessment books. I forgot this is primary 5, lol. Sorry for the error. This is absolutely valid.

[chloecube]

Three team A,B&C participated in a competition. There were 34 pupils in team B & C. If 22 pupil were not in team B n 28 pupil were in team C,how many pupil were there altogether in the three teams?

[PiscesLeo]

Keith puts some sweets into 3 bottles, A, B and C. The ratio of the number of sweets in bottle A and bottle B is 1:2. The ratio of the number of sweets in bottle B to bottle C is 3:2. If Keith transfers a number of sweets from bottle B to bottles A and C, she will have an equal number of sweets in the 3 bottles. The total number of sweets in bottle A will then increase by 24.


a) How many sweets were transferred from bottle B to bottle C?
b) What is the total number of sweets in the three bottles?

Please help. Thank you.