Q&A - P4 Math

[MathIzzzFun]

babies:

Hi,


I need some help again... :oops:

1)
The cost of 2 mangoes and 1 apple is $3.40.
The cost of 1 mango and 2 apples is $2.60.
Find the cost of a mango.

2)
Jessie has a bag of balloons for her class. After giving 8 balloons to each pupil, she would have 4 balloons left. If she gives 5 balloons to everyone, she would have 58 balloons left. How many pupils are there in her class?

3)
In a quiz, 4 marks are awarded for every correct answer and 2 marks are deducted for every wrong answer given. Jenny answered a total of 50 questions. How many questions did she answer correctly if she had a score of 140 marks?

Thanks in advance!

Hi

Q2.

http://i43.tinypic.com/ebebeb.jpg\">

Q3.
For every question answered wrongly, marks lost = 4 + 2 = 6 marks
If all were correct, total marks --> 4 x 50 =200 marks.
Marks lost for wrong answers --> 200 - 140 = 60
60 / 6 = 10 --> 10 questions answered wrongly.
40 questions answered correctly.

cheers.

[babies]

smartmummy:

babies:

Hi,


I need some help again... :oops:

1)
The cost of 2 mangoes and 1 apple is $3.40.
The cost of 1 mango and 2 apples is $2.60.
Find the cost of a mango.

2)
Jessie has a bag of balloons for her class. After giving 8 balloons to each pupil, she would have 4 balloons left. If she gives 5 balloons to everyone, she would have 58 balloons left. How many pupils are there in her class?

Thanks in advance!

1)
3 mangoes+3apples=$6
1mango +1 apple =$2
Apple=$0.60 (applying in 2nd en)
Mango=$1.40 (applying in first en)

Hi smartmummy,

Thank you!

[babies]

MathIzzzFun:

babies:

Hi,


I need some help again... :oops:

1)
The cost of 2 mangoes and 1 apple is $3.40.
The cost of 1 mango and 2 apples is $2.60.
Find the cost of a mango.

2)
Jessie has a bag of balloons for her class. After giving 8 balloons to each pupil, she would have 4 balloons left. If she gives 5 balloons to everyone, she would have 58 balloons left. How many pupils are there in her class?

3)
In a quiz, 4 marks are awarded for every correct answer and 2 marks are deducted for every wrong answer given. Jenny answered a total of 50 questions. How many questions did she answer correctly if she had a score of 140 marks?

Thanks in advance!

Hi

Q2.

http://i43.tinypic.com/ebebeb.jpg\">

Q3.
For every question answered wrongly, marks lost = 4 + 2 = 6 marks
If all were correct, total marks --> 4 x 50 =200 marks.
Marks lost for wrong answers --> 200 - 140 = 60
60 / 6 = 10 --> 10 questions answered wrongly.
40 questions answered correctly.

cheers.

Hi MathIzzzFun,

Thank you!

[Xiao Hu]

tianzhu:

chloecube:

i am stuck for Q1,4,9,
Tianshu, can help? thks!

Hi

Please see this earlier solution for a similar question.It should help to answer 1 and 4.

Best wishes

Hi Tianzhu,
The solution pasted was removed. Can you help give the solution one more time for this Q4?

\"4)There were 50 children in Xie Ming Ming’s party. Each boy ate 10 cookies. Each girl ate 7 cookies. All the girls ate 44 more cookies than all the boys. How many more girls than boys were there? (14)\"

TIA,
Xiaohu

[tianzhu]

Xiao Hu:

Hi Tianzhu,
The solution pasted was removed. Can you help give the solution one more time for this Q4?

\"4)There were 50 children in Xie Ming Ming’s party. Each boy ate 10 cookies. Each girl ate 7 cookies. All the girls ate 44 more cookies than all the boys. How many more girls than boys were there? (14)\"

TIA,
Xiaohu

Hi Xiao Hu

Good Morning.

Here's an earlier slide for a similar type of questions.

The solution to Xie question.

Assume all were girls.

50*7 ------ 350
(49*7) – 10 ------ 333

For every increase of 1 boy, the difference in the number of cookies drops by 17.

350 – 44 ------ 306
306/17 ------ 18

So, we have 18 boys and 32 girls.

Hence, there are 14 more girls than boys.

Best wishes

http://farm8.staticflickr.com/7016/6828705773_53738730b6_z.jpg\">

[Xiao Hu]

tianzhu:

Xiao Hu:

Hi Tianzhu,
The solution pasted was removed. Can you help give the solution one more time for this Q4?

\"4)There were 50 children in Xie Ming Ming’s party. Each boy ate 10 cookies. Each girl ate 7 cookies. All the girls ate 44 more cookies than all the boys. How many more girls than boys were there? (14)\"

TIA,
Xiaohu

Hi Xiao Hu

Good Morning.

Here's an earlier slide for a similar type of questions.

The solution to Xie question.

Assume all were girls.

50*7 ------ 350
(49*7) – 10 ------ 333

For every increase of 1 boy, the difference in the number of cookies drops by 17.

350 – 44 ------ 306
306/17 ------ 18

So, we have 18 boys and 32 girls.

Hence, there are 14 more girls than boys.

Best wishes

http://farm8.staticflickr.com/7016/6828705773_53738730b6_z.jpg\">

Hi Tianzhu,
Thanks so much. This solution to me is more than just supposition strategy. This has Suppostion, Listing/Tabulating and Looking for a pattern strategies all in.

Good question from you!!

Thanks,
Xiaohu

[chloecube]

Tim has 336 local and foreign stamps at first. He gave away 2/5 of the local stamps and 46 foreign stamps. He then found that he had 3/5 as many local stamps as foreign stamps left. How many foreign stamps did he have at first?

[tianzhu]

chloecube:

Tim has 336 local and foreign stamps at first. He gave away 2/5 of the local stamps and 46 foreign stamps. He then found that he had 3/5 as many local stamps as foreign stamps left. How many foreign stamps did he have at first?

Hi

You may use MD

Local
Gave ------- 2 units
Left ------ 3 units

Foreign
Gave ------ 46
Left ------ 5 units

10 units + 46 ------- 336
10 units ------ 290
1 unit ------- 29

Foreign stamps @first ------ (5*29) + 46 ------- 191

Best wishes

[chloecube]

Thks for fast reply tianzhu

[Tresille]

Hi, need your assistance.


John has a total of 20 apples and pears. If he exchanges every pear for 2 apples, she will have 28 apples. How many apples and pears does he have? Can we use model drawing to solve this qn?