Tutor MathsGuru: Ask me for your burning Maths questions!

[Bunny27]

Always21:

Many thanks

Hi, someone pls help on this question. TIA

1. Cheryl, Siti and Audrey have some money.
If Cheryl gives $3.50 to Siti, the two girls will have an equal amount of money. If Siti gives $3.50 to Cheryl, Cheryl will have 3 times as much money as Siti. Audrey's share is the sum of the other girls.
How much money do they have altogether?

[MathIzzzFun]

Bunny27:

Always21:

Many thanks

Hi, someone pls help on this question. TIA

1. Cheryl, Siti and Audrey have some money.
If Cheryl gives $3.50 to Siti, the two girls will have an equal amount of money. If Siti gives $3.50 to Cheryl, Cheryl will have 3 times as much money as Siti. Audrey's share is the sum of the other girls.
How much money do they have altogether?

Hi

Try drawing a model and you should be able to visualize the transfers..alternatively you could also use ratios/units & parts approach to solve this ...


If Cheryl gives $3.50 to Siti, the two girls will have an equal amount of money --> So, Cheryl has $ 7.00 more than Siti

If Siti gives $3.50 to Cheryl, Cheryl will have 3 times as much money as Siti --> Cheryl has $7.00 more than Siti, if Siti gives $3.50 to Cheryl, Cheryl would have $7.00 + $7.00 = $ 14.00 more than Siti. We have
Cheryl --> 3 units
Siti --> 1 unit and therefore 2 unit --> $ 14.00, 1 unit --> $ 7.00

Total amount of money --> Audrey's money + Cheryl's money + Siti's money = 4 units + 3 units + 1 unit --> 8 x $ 7.00 = $ 56.00 (Cheryl $ 17.50, Siti $10.50, Audrey $28.00)


cheers.

[violin_lover]

Good reasoning

[kwcllf]

Hi please help with the following question:


Classes 6A and 6B have the same number of pupils. The ratio of the number of boys in 6A to 6B is 4:3. The ratio of the number of girls in 6A to the number of girls in 6B is 4:7. Find the ratio of the number of boys to the number of girls in 6A.

Thanks

[MathIzzzFun]

kwcllf:

Hi please help with the following question:


Classes 6A and 6B have the same number of pupils. The ratio of the number of boys in 6A to 6B is 4:3. The ratio of the number of girls in 6A to the number of girls in 6B is 4:7. Find the ratio of the number of boys to the number of girls in 6A.

Thanks

Hi

a similar question was discussed some time ago - http://www.flickr.com/photos/62167097@N02/5760364658/in/photostream

cheers.

[kwcllf]

Hi MathIzzzFun,


Thanks again for the help!

[MathIzzzFun]

kwcllf:

Hi MathIzzzFun,


Thanks again for the help!

u r welcome

cheers.

[kwcllf]

Hi Please help with the following question:


There are some marbles. They are used to make a square with 13 rows and 13 columns. The marbles are then rearranged to form 2 squares, with the smaller square having 7 marbles less than the bigger square in each row. How many marbles are there in each row for the 2 squares?

Thanks.

[MathIzzzFun]

kwcllf:

Hi Please help with the following question:


There are some marbles. They are used to make a square with 13 rows and 13 columns. The marbles are then rearranged to form 2 squares, with the smaller square having 7 marbles less than the bigger square in each row. How many marbles are there in each row for the 2 squares?

Thanks.

Hi
This will involve solving of quadratic equations which are taught in Sec.

For upper primary, use Guess and Check, you will get 5 per row for small square and 12 per row for big square (13 x 13 = 5 x 5 + 12 x 12)

cheers.

[kwcllf]

MathIzzzFun:

kwcllf:

Hi Please help with the following question:


There are some marbles. They are used to make a square with 13 rows and 13 columns. The marbles are then rearranged to form 2 squares, with the smaller square having 7 marbles less than the bigger square in each row. How many marbles are there in each row for the 2 squares?

Thanks.

Hi
This will involve solving of quadratic equations which are taught in Sec.

For upper primary, use Guess and Check, you will get 5 per row for small square and 12 per row for big square (13 x 13 = 5 x 5 + 12 x 12)

cheers.

Hi,

I am a little confused. My kid was also told to use Guess & Check.

But if marbles are used to make 13 rows and 13 columns, aren't there 14 marbles needed across each rows and columns to construct the square grid? That is, there are 14x14=196 marbles in total if we use the marbles to mark each point on the square grid.

The question said there are 7 marbles more in each row for the bigger sqaure. It didn't say there are 7 rows more :?