Q&A - P3 Math

[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.

[ericleets]

Hi Parents,


Need help again.

John bought a total of 50 roses and sunflowers.
Each rose costs $3 and each sunflower costs $1 less.
She spent a total of $120.
How many roses and sunflowers did she buy?

Thanks in advance.
Eric

[BigDevil]

:yikes: Still working on Math problems 4 days before Christmas??


Rose $3; Sunflower $2

Assume all sunflowers: 50 x $2 = $100
Difference: $120 - $100 = $20
Divide: $20 / $1 = 20

20 roses, 30 sunflowers.

Check:
(20 x $3) + (30 x $2) = $60 + $60 = $120

[qms]

BigDevil:

:yikes: Still working on Math problems 4 days before Christmas??

http://i875.photobucket.com/albums/ab313/Burzuk2/Emoticons/smiley/ybs-28.gif\">

And you are still solving Math problems 4 days before Christmas?