Q&A - P3 Math

[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

[SAHM Chew]

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

Assume 22 pencils $22 x $1 =$22
$27 - $22 = $5
$5 / $0.50 = 10 pens
22 - 10 = 12 pencils.

[ericleets]

Many thanks for your explanation…

Have a great day.