Tutor MathsGuru: Ask me for your burning Maths questions!

[wahwah]

Hi jieheng,

Thanks for the detailed explanation.
Sorry to trouble you again. Can you explain the working for this question?

2. Wayne had five more 50cents coins than 20cents coins. After he used eight 50cents coins, the value of 50cents coins is $1.50 more than the value of 20cents coins. How many coins did he have at first?


50cents [------][ 3][5]
20cents [-----][3]

value of [3] = 3 * 0.2 = $0.60

the difference in value between [------] and [-----] = 1.5 + 0.6 = 2.1
What are we trying to find here?

the difference in value of one coin between 50 cents and 20 cents = $0.30

number of coins in [------] = 2.1 / 0.3 = 7

Total number of coins he had at first =( 7 + 3 ) * 2 + 5 = 25 (Ans
How to get (7+3)*2+5?

[jieheng]

wahwah:

Hi jieheng,

Thanks for the detailed explanation.
Sorry to trouble you again. Can you explain the working for this question?

2. Wayne had five more 50cents coins than 20cents coins. After he used eight 50cents coins, the value of 50cents coins is $1.50 more than the value of 20cents coins. How many coins did he have at first?


50cents [------][ 3][5]
20cents [-----][3]

value of [3] = 3 * 0.2 = $0.60

the difference in value between [------] and [-----] = 1.5 + 0.6 = 2.1
What are we trying to find here?

the difference in value of one coin between 50 cents and 20 cents = $0.30

number of coins in [------] = 2.1 / 0.3 = 7 ,


Total number of coins he had at first =( 7 + 3 ) * 2 + 5 = 25 (Ans
How to get (7+3)*2+5?

At first ,

number of coins in [------] = 2.1 / 0.3 = 7 ,

number of coins in [-----] = 7

the number of 50-cents coins he had = [------][ 3][5] = 7 + 3 + 5

the number of 20-cents coins he had = [-----][3] = 7 + 3

total number of coins he had at first =(7 + 3 + 5) + 7 + 3 = =( 7 + 3 ) * 2 + 5 = 25

[YumYum]

Hi,


Will it be possible to assist with the following Qn:

Aifang, Bala and Cindy shared some sweets. Aifang received 1/11 of the sweets. Bala received 1/4 of the number of sweets Cindy received. When Cindy gave away 104 sweets to be shared between Aifang and Bala, they found that all of them had the same number of sweets. How many sweets were there at first?

Thanks

[MathIzzzFun]

YumYum:

Hi,


Will it be possible to assist with the following Qn:

Aifang, Bala and Cindy shared some sweets. Aifang received 1/11 of the sweets. Bala received 1/4 of the number of sweets Cindy received. When Cindy gave away 104 sweets to be shared between Aifang and Bala, they found that all of them had the same number of sweets. How many sweets were there at first?

Thanks

Hi

Hope this helps :lol:


http://postimage.org/image/fmbqjx2c/

cheers.

[YumYum]

MathIzzzFun:

YumYum:

Hi,


Will it be possible to assist with the following Qn:

Aifang, Bala and Cindy shared some sweets. Aifang received 1/11 of the sweets. Bala received 1/4 of the number of sweets Cindy received. When Cindy gave away 104 sweets to be shared between Aifang and Bala, they found that all of them had the same number of sweets. How many sweets were there at first?

Thanks

Hi

Hope this helps :lol:


http://postimage.org/image/fmbqjx2c/

cheers.

thank you

[YumYum]

Hi,


I have some Qns which I need some help with. My son is still struggling with the method to use. I bought \"Challenging Maths Problems Made Easy\" by Ammiel Wan, though he can do the Qns from the book, he struggles when it comes to those from past papers. Any advice on how to tackle this *big* problem? :?

1. Mary, Omar and AiLing shared $4590 amongst themselves. Omar and Ailing shared 4/9 of the money equally. After Omar gave away some of his money to Mary, Ailing had 3 times as much money as Omar. How much money did Omar give to Mary?

2. Alice & Gillian had a total of $555. Alice spent 5/6 of her money and Gillian spent 2/9 of her money. In the end, the amount of money Gillian had left was 7 times the amount of money Alice had left.

(a) how much money did Alice spend?

(b) What was the total amount of money left?

3. The ratio of the number of pencils to the number of erasers in a box is 7:3. When 36 pencils are removed and 24 erasers are added, there is an equal number of pencils and erasers. How many pencils are there in the box in the end?

4. Gary and Jane shared the cost of a dinner in the ratio of 2:3. Gary used half of his money to pay for his share. After paying fo her share, Jane had $84 left. The ratio of the amount of money that Gary had at first to the amount of money Jane had at first was 3:4. How much was the total bill for the dinner?


5. Ravi had a total of 204 goldfish and swordtails in the ratio of 9: 8. After she gave away an equal number of each type of fish, the number of goldfish and swordtails left was in the ratio of 9:5 respectively. What was the total number of fish that she had given away?

many thanks

[YumYum]

Hi,


Can anyone pls help with this Qn:

A group of children bought some marbles to be shared among themselves.
If each child were given 10 marbles, there would be 15 marbles left over.

If each child were given 12 marbles, there would be 1 marble left over.
(a) How many children were there in the group?
(b) How many marbles did they buy?

thank you

[HappyFaye]

A. 7 children

B. 85 marbles

But I have problem explaining this using model. :c

[HappyFaye]

Ok, let me try again.


In this case, ‘Broken’ Model is used as we do not know how many units/boxes to draw.

First construct a ‘broken’ model of a multiple of 10 with 15 left

When each children were given 12 marbles, it is the same as each child is getting another 2 more marbles. We can then construct another ‘broken’ model of a multiple of 4 + multiple of 2 with 1 left.

So 15 - 1 = 14 marbles.

Since 14 marbles were given to the number of children of 2 more marbles each,
14 marbles / 2 –> 7

So 7 children have 2 more marbles each.

So there are 7 children.

If each child has 10 marbles, total marbles –> (10 x 7) + 15 = 85
The answer is the same if each child has 12 marbles.

Hope this is not too confusing, without the broken models drawn here.

[MathIzzzFun]

YumYum:

MathIzzzFun:

[quote=\"YumYum\"]Hi,


Will it be possible to assist with the following Qn:

Aifang, Bala and Cindy shared some sweets. Aifang received 1/11 of the sweets. Bala received 1/4 of the number of sweets Cindy received. When Cindy gave away 104 sweets to be shared between Aifang and Bala, they found that all of them had the same number of sweets. How many sweets were there at first?

Thanks

Hi

Hope this helps :lol:


http://postimage.org/image/fmbqjx2c/

cheers.

thank you :D[/quote]Hi

avec plaisir :lol:

cheers.