Q&A - P5 Math

[Jamesbond]

Jamesbond:

http://i46.tinypic.com/5a3mms.jpg\">

Pl help me solve (b) & (c).

In such a similar question, if the total number of squares are given and asked to find out how many patterns can be made, how to do this?

[MathIzzzFun]

Jamesbond:

Jamesbond:

http://i46.tinypic.com/5a3mms.jpg\">

Pl help me solve (b) & (c).

In such a similar question, if the total number of squares are given and asked to find out how many patterns can be made, how to do this?

Total number of squares is a square number --> 1x1, 2x2, 3x3 ...

Pattern 1 --> 4 = 2 x 2
Pattern 2 --> 9 = 3 x 3
Pattern 3 --> 16 = 4 x 4

So, given total number of squares in a pattern --> take the square root, and the pattern number = square root - 1.

cheers.

[MathIzzzFun]

poohbeardoremi:

Need help with the following questions please:


1)
There were 588 children in an exhibition in the morning. After 219 girls left and 86 boys entered the exhibition in the afternoon, 2/3 of the total no. of girls was then equal to 1/2 of the total no. of boys left. How many girls were there at the exhibition at first?

Thanks in advance.

In the end, total number of students = 588 - 219 + 86 = 455
and
2/3 girls = 1/2 boys --> 2/3 girls = 2/4 boys

Girls --> 3 units
boys --> 4 units
total 7 units --> 455
1 unit --> 65

Girls, at first --> 3 x 65 + 219 = 414

cheers.

[Jamesbond]

MathIzzzFun:

Jamesbond:

[quote=\"Jamesbond\"]http://i46.tinypic.com/5a3mms.jpg\">

Pl help me solve (b) & (c).

In such a similar question, if the total number of squares are given and asked to find out how many patterns can be made, how to do this?

Total number of squares is a square number --> 1x1, 2x2, 3x3 ...

Pattern 1 --> 4 = 2 x 2
Pattern 2 --> 9 = 3 x 3
Pattern 3 --> 16 = 4 x 4

So, given total number of squares in a pattern --> take the square root, and the pattern number = square root - 1.

Thanks

cheers.[/quote] :thankyou:

[MathIzzzFun]

poohbeardoremi:

Need help with the following questions please:



3)
Cartons Y and Z contained some apples. If 20 apples were transferred from carton Y to carton Z, both cartons would have the same no. of apples. If 13 apples were transferred from carton Z to carton Y, carton Y would have 4 times as many apples as carton Z. How many apples were there in carton Y at first?

Thanks in advance.

http://i46.tinypic.com/15x4gab.png\">

cheers.

[poohbeardoremi]

A big thank you to MathIzzzFun. Greatly appreciated!

Have a nice day.

[redruby]

Tan and Ann have some money each. If Tan and Ann spend $12 and $16 each day respectively, Ann will still have $300 when Tan has spent all his money. If Tan and Ann spend $6 and $12 each day respectively, Ann will still have $120 when Tan has spent all his money. How much money did each have?

Have almost tried very hard solving this and finally gave up…Anybody to help me out???

[Suz855]

[quote=\"redruby\"]Tan and Ann have some money each. If Tan and Ann spend $12 and $16 each day respectively, Ann will still have $300 when Tan has spent all his money. If Tan and Ann spend $6 and $12 each day respectively, Ann will still have $120 when Tan has spent all his money. How much money did each have


Deleted :oops:

[MathIzzzFun]

redruby:

Tan and Ann have some money each. If Tan and Ann spend $12 and $16 each day respectively, Ann will still have $300 when Tan has spent all his money. If Tan and Ann spend $6 and $12 each day respectively, Ann will still have $120 when Tan has spent all his money. How much money did each have?

Have almost tried very hard solving this and finally gave up...Anybody to help me out?????

Tan spends $12, Ann spends $16:
Tan's spending : Ann's spending = 12 : 16 --> 3u : 4u
Tan's money --> 3u
Ann's money --> 4u + $300

Tan spends $6, Ann spends $12:
Tan's spending : Ann's spending = 6 : 12 --> 3u : 6u
Tan's money --> 3u
Ann's money --> 6u + $120

Ann's money:
4u + $300 = 6u + $120
1u --> $90

Ann's money --> 4 x $90 + $300 = $660
Tan's money --> 3 x $90 = $270


(number of days of spending in first case --> 22.5 days - \"precision spending\")

cheers.

[redruby]

MathIzzzFun:

redruby:

Tan and Ann have some money each. If Tan and Ann spend $12 and $16 each day respectively, Ann will still have $300 when Tan has spent all his money. If Tan and Ann spend $6 and $12 each day respectively, Ann will still have $120 when Tan has spent all his money. How much money did each have?

Have almost tried very hard solving this and finally gave up...Anybody to help me out?????

Tan spends $12, Ann spends $16:
Tan's spending : Ann's spending = 12 : 16 --> 3u : 4u
Tan's money --> 3u
Ann's money --> 4u + $300

Tan spends $6, Ann spends $12:
Tan's spending : Ann's spending = 6 : 12 --> 3u : 6u
Tan's money --> 3u
Ann's money --> 6u + $120

Ann's money:
4u + $300 = 6u + $120
1u --> $90

Ann's money --> 4 x $90 + $300 = $660
Tan's money --> 3 x $90 = $270


(number of days of spending in first case --> 22.5 days - \"precision spending\")

cheers.

Answer given is Tan=$120...Ann=$360....Is this answer wrong?????
Please clarify......