Q&A - P4 Math

[yeonee]

yeonee:

chloecube:

Q5)


Assuming all are goats,
65 x 4 = 260
260 – 196 = 64
Difference numbers of legs between duck and goat = 4-2 = 2
64/2 =32 ducks
65 – 32 = 33 goats

Check : 32 ducks x 2 legs = 64
33 goats x 4 legs = 132
64 + 132 = 196 legs

Q6)
Assuming all are cows,
75 x 4 = 300
300-220=80
Difference numbers of legs = 4-2 = 2
80/2=40ducks
75-40=35 cows

Check : 40 ducks x 2 legs =80
35 cows x 4 legs = 140
140+80=220 legs

Q7)
Assuming she answered all correctly:
20 x 5 = 100
100 – 79 = 21
Differences = 5+2 = 7
21 / 7 = 3 wrong answers
20 – 3 =17 correct answers

Check: 17 x 5 = 85
3 x 2 = 6
85 -6=79

Q8)

Assuming all coins are 50cents
38 x 50cents = $19
19 – 13.60 = 5.40
Differences = 50-20= 30cents
5.4/ 0.3 = 18 20cents
38 – 18 = 20 50cents
Ratio : 18 : 20
9: 10

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

Hi,

I don't understand why the answer to question 7 is 17. If she answered 17 correct questions and 3 wrong questions, isn't her marks 94 [(17x5) + (3x2)]?

Sorry, typo error. Should be 3x3.

[BigDevil]

yeonee:

yeonee:

[quote=\"chloecube\"]
Q7)
Assuming she answered all correctly:
20 x 5 = 100
100 – 79 = 21
Differences = 5+2 = 7
21 / 7 = 3 wrong answers
20 – 3 =17 correct answers

Check: 17 x 5 = 85
3 x 2 = 6
85 -6=79

Hi,

I don't understand why the answer to question 7 is 17. If she answered 17 correct questions and 3 wrong questions, isn't her marks 94 [(17x5) + (3x2)]?

Sorry, typo error. Should be 3x3.[/quote]This was the original question:[quote]7)In a Maths quiz, each pupil had to answer 20 questions. 5 points were given for each correct answer and 2 points were taken away from each wrong answer. Mirabel answered all questions and scored 79 points. How many questions did she answer correctly? (17) [/quote]So chloecube was correct to have (17x5) - (3x2) = 79

[Jamesbond]

1) There were 260 marbles in a box. 1/2 of the marbles were blue and 3/10 of them were green. The rest were red. How many red marbles were there?


2)What is 3/8 of 18? Express in the simplest form?(I doubt whether this is a correct questn)

PL explain in detail…Thank you…

[Herbie]

Jamesbond:

1) There were 260 marbles in a box. 1/2 of the marbles were blue and 3/10 of them were green. The rest were red. How many red marbles were there?


2)What is 3/8 of 18? Express in the simplest form?(I doubt whether this is a correct questn)

PL explain in detail...Thank you....

5/10 -blue
3/10 - green
2/10 - RED

[yeonee]

Noted. Thank you.

[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!

[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)

[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!