Q&A - P5 Math

[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......

[MathIzzzFun]

redruby:

MathIzzzFun:

[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?

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......[/quote]If the question is changed to :
Tan and Ann have some money each. If Tan and Ann spend $12 and $6 (not $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?\",

then
Tan's money --> $120
Ann's money --> $360

cheers.

[BigDevil]

MathIzzzFun:

BigDevil:

There are 45 peach tarts, 120 strawberry tarts and 150 chocolate tarts. If all the tarts are placed into the least number of boxes such that there are equal number of each type of tarts in each box, how many tarts are there in each box ?

this question is not structured properly... it would be more logical to replace \"least\" with \"maximum\".

cheers.

:hi5:

Someone posted this question at onsponge.com and I reproduced it here
to see if the experts here share my opinion.

My respond to this question at onsponge.com....

Least number of boxes?? Isn't the least number of box...1??