Q&A - P4 Math

[Champion]

kiasuMay11:

Champion:

Hi All! Needs :?: with the following three Maths Questions. Please advise with Model Drawings if possible; :thankyou:


1) Jane exchanged 12 $10-notes for $2-notes and $5-notes.
The total value of the $5-notes was 5 times the total value of the $2-notes.
How many more $5-notes than $2-notes did she get?


2) Jeremy has 8 more 20-cents coins than $1-coins.
If he has $8.80 in total, how many coins does he have altogether?


3) Gabriel, Hosea and Issac shared a birthday cake of mass 3kg.
Gabriel ate 4/15 of the cake and Hosea ate 7/11 of the remaining cake.
If Issac ate the rest of the birthday cake, what the mass of the birthday cake that Issac ate? Express your answer in its simplest form.

I only good for (3)

http://i47.tinypic.com/2wr2mio.jpg\">

1st 15 blk
shape 4 blk for 4/15
u can see 11 blk remain which tally with the denominator of 7/11
next shape 7 blk of remaining 11 blk
Thus, 4 blk left for Issac
u know total is 3kg, 3/15=> 0.2kg per unit
Therefore, Issac = 4*0.2 = 0.8kg

Hope other can help on other question with model as I would like to learn how, too

:celebrate: :thankyou: VERY MUCH

[Champion]

BigDevil:

Champion:

Hi All! Needs :?: with the following three Maths Questions. Please advise with Model Drawings if possible; :thankyou:


1) Jane exchanged 12 $10-notes for $2-notes and $5-notes.
The total value of the $5-notes was 5 times the total value of the $2-notes.
How many more $5-notes than $2-notes did she get?

http://i45.tinypic.com/neghfr.jpg\">

:celebrate: :thankyou: VERY MUCH!

[Champion]

BigDevil:

Champion:

2) Jeremy has 8 more 20-cents coins than $1-coins.
If he has $8.80 in total, how many coins does he have altogether?

http://i46.tinypic.com/a4xttu.jpg\">
Check:
Number of 20 cents coins = 6 + 8 = 14
Value of 20 cts coins = 14 x $0.20 = $2.80

Number of $1 coins = 6
Value of $1 coins = $6

Total value = $2.80 + $6 = $8.80

:celebrate: :thankyou: VERY MUCH!

[BigDevil]

Jamesbond:

Tan bought some fruits. 2/7 of the fruits were apples. The number of oranges was 1/4 the number of pears. What fraction of the fruits were pears?


Pl help....

http://i48.tinypic.com/2v33mu8.jpg\">

[htn]

BigDevil:

Jamesbond:

[quote=\"htn\"]Hi, need help for the following:


1) Jack is 50 years older than Alice. In 20 years' time, he will be twice as old as her. What is Alice's age now?

1) 50 + 20 = 70
70 + 20 = 90
90/3 = 30
30-20 = 10 Yrs old...

http://i46.tinypic.com/2mm72bs.jpg\">

Check:
Alice 30, Jack = (30 + 50) = 80

20 years later,
Alice is 30 + 20 = 50
Jack is 80 + 20 = 100 (twice of Alice)[/quote]
Hi, thanks BigDevil and Jamesbond for the solution, the answer is 30 years old, but my child still don't understand, is there another way to do it.

Thanks

[Jamesbond]

BigDevil:

Jamesbond:

Tan bought some fruits. 2/7 of the fruits were apples. The number of oranges was 1/4 the number of pears. What fraction of the fruits were pears?


Pl help....

http://i48.tinypic.com/2v33mu8.jpg\">

Thank you very much for the solution and also for correcting me in the earlier sum.

[Sharmum]

Hi,


Appreciate if someone can help on this one:-

Kelvin and Ron had $135 altogether. After kelvin spent 2/5 of his money and Ron spent $79, they had an equal amount of money left. How much did Kelvin have at first?

Thank you.

[Jamesbond]

Sharmum:

Hi,


Appreciate if someone can help on this one:-

Kelvin and Ron had $135 altogether. After kelvin spent 2/5 of his money and Ron spent $79, they had an equal amount of money left. How much did Kelvin have at first?

Thank you.

Let me try...

135 - 79 = 56

56 / 8 = 7

7 * 5 = 35

Ans - $35...

[Jamesbond]

http://i49.tinypic.com/2vb8y2s.jpg\">


Pl help.

[kwcllf]

Jamesbond:

http://i49.tinypic.com/2vb8y2s.jpg\">


Pl help.

Area of floor = 25 x 20 = 500

Area of a tile = 5 x 4 = 20

No. Of tiles = 500/20 = 25