Q&A - P3 Math

[Muffins]

Kiatkhim:

Anyone can help to interpret a problem sum in my DS SA2 Maths? I find the question quite confusing:-


Mr Yeong had to paint the chairs in the hall red or blue. After he had painted 1567 chairs, Mr Yeong still had another 865 chairs to paint. Given that he painted 769 chairs red, how may chairs were painted blue?

Thanks in advance!

Hi

The way I would go about thinking is this: He already painted 1567 chairs, and he had 865 more to paint. If he painted 769 chairs red in total, then the answer would be 1663. But if he painted 769 chairs from the 1567, then the answer should be 798. Answer's open to debate. Ambiguous questioning...

[Kiatkhim]

Kiatkhim:

Thanks v much for all your replies. Given answer by school is 1663. 1663 is full 4 marks while 798 is only 1 mark (for consolation!). DS and friends in school usually good in Maths also puzzled.

The school teachers had decided that 798 is also an acceptable answer. DS was so happy!

[dazzlego]

Kiatkhim:

Kiatkhim:

Thanks v much for all your replies. Given answer by school is 1663. 1663 is full 4 marks while 798 is only 1 mark (for consolation!). DS and friends in school usually good in Maths also puzzled.

The school teachers had decided that 798 is also an acceptable answer. DS was so happy!

They should have make both answers to be the correct one :evil:

[tracywham]

Hi, sorry to trouble all of you again and need your help to solve this question.


Dave has 11 times as much as Oscar. Calvin and Dave have $172. Calvin and Oscar have $92. How much does Calvin have?

[KP2]

tracywham:

Hi, sorry to trouble all of you again and need your help to solve this question.


Dave has 11 times as much as Oscar. Calvin and Dave have $172. Calvin and Oscar have $92. How much does Calvin have?

Hi tracywham ,
Let me try

D=11os
Calvin + Dave (11os)= 172
Calvin+ 1os = 92
So, 11os - 1os = 172-92
= 80
1os = 8
Calvin = 92-8
= 84

Hope this helps !

[Sun_2010]

tracywham:

Hi, sorry to trouble all of you again and need your help to solve this question.


Dave has 11 times as much as Oscar. Calvin and Dave have $172. Calvin and Oscar have $92. How much does Calvin have?

http://i47.tinypic.com/iel8p3.jpg\">

[BigDevil]

Sorry, Sun. Did you post a wrong diagram?

[Sun_2010]

BigDevil:

Sorry, Sun. Did you post a wrong diagram?

:oops:
The correct one
http://i50.tinypic.com/2s13n2t.gif\">

[X_ist]

Sun_2010:

tracywham:

Hi, sorry to trouble all of you again and need your help to solve this question.


Dave has 11 times as much as Oscar. Calvin and Dave have $172. Calvin and Oscar have $92. How much does Calvin have?

http://i47.tinypic.com/iel8p3.jpg\">

$172 (Calvin and Dave) - $92 (Calvin and Oscar) = $80 (How much Dave has more than Oscar)

Dave has = $80/10*11 = $88

Calvin has = $172-$88 = $84

[ericleets]

Hi, need help below.

John bought total 22 pens and pencils.
Each pencil cost $1 and each pen cost $1.50
He spent total $27.
How many pens and pencils did he buy?

It was told that can only use assumption than guess and check method.
My working below.

Assume 22 pencils; 22x$1=$22;
$27-$22=$5;
$5÷$1=5
But 5pens is $7.50?

I am stuck here. Please help…

Thanks