Q&A - P4 Math

[pineapple tarts]

OMG, I must be blind !! :thankyou:

[MathIzzzFun]

pineapple tarts:

MathIzzzFun:

[quote=\"pineapple tarts\"]Sorry, my question was wrong. Correction below.


Mary spent $40 on 4 hairclips and 4 hairbands. 2 hairclips cost as much as 3 hairbands. FInd the cost of 1 hairband.

Hi

4 clips + 4 bands = $40
2 clips + 2 bands = $ 20
Since 2 clips = 3 bands, 3 bands + 2 bands = $ 20 ie 5 bands = $20, so 1 band = $4

cheers.

Many thanks MathIzzzFun,

Can I ask, I keep seeing it as 3 bands + 3 bands = $20.
I cannot see 3 bands + 2 bands. pls enlighten me. [/quote]Hi

hope this helps ...

http://i39.tinypic.com/21o0dwx.jpg\">

cheers.

[pineapple tarts]

Thank you for your help, we solved all the (this type) questions.

[sokk]

Hi,

I need help for the following question.

Michelle has more than 50 hairpins.
If she puts them in packets of 7, she has 5 hairpins left.
If she puts them in packets of 9, she has 6 hairpins left.
How many hairpins does Michelle have?

Thanks!

[Mychildren]

The answer is 96.

Why? Because
>50
so
if packed in 7 with a remainder 5:
49+5 ; 56+5 ; 63+5 ; 70+5 ; 77+5 ; 84+5 ; 91+5
54 ; 61 ; 68 ; 75 ; 82 ; 89 ; 96
if packed in 9 with a total of the above, which no. I can get remainder 6?
6 r 0 ; 6 r 7 ; 7 r 5 ; 8 r 2 ; 9 r 1 ; 9 r 8 ; 10 r 6

So 96 is the answer.

[sokk]

Thank you Mychildren and WCW for the explanations!


WCW, the table u created helps greatly , thanks!

[Mychildren]

Its my pleasure, sokk! I love to crack my head if not will be rusty. Who knows? Someday you might be the one who is solving my queries here! :?:

[ozora]

need help on this following question.

there are 3 different types of tiles.
Tile A- 0.54 kg
Tile B - 0.76kg
Tile C-0.63kg

Kim has a stack of 21 different types of tiles which are made of a combination of Tiles A, B and C. 9 of them are Tiles C and the total mass of 21 tiles is 13.69kg. How many tiles A and B are there respectively?

[zeemimi]

ozora:

need help on this following question.

there are 3 different types of tiles.
Tile A- 0.54 kg
Tile B - 0.76kg
Tile C-0.63kg

Kim has a stack of 21 different types of tiles which are made of a combination of Tiles A, B and C. 9 of them are Tiles C and the total mass of 21 tiles is 13.69kg. How many tiles A and B are there respectively?

this is a guess and check question.

Wt of 9 tiles C = 9 x 0.63 = 5.67kg
Wt of tiles A & B = 13/69 - 5.67 = 8.02kg
# of tiles A & B = 21 - 9 = 12

Guess and check
6A & 6B = (6x0.54) + (6x0.76) = 7.8kg
5A & 7B = (5x0.54) + (7x0.76) = 8.02

5 tile A and 7 tile B

[jedamum]

zeemimi:

ozora:

need help on this following question.

there are 3 different types of tiles.
Tile A- 0.54 kg
Tile B - 0.76kg
Tile C-0.63kg

Kim has a stack of 21 different types of tiles which are made of a combination of Tiles A, B and C. 9 of them are Tiles C and the total mass of 21 tiles is 13.69kg. How many tiles A and B are there respectively?

this is a guess and check question.

Wt of 9 tiles C = 9 x 0.63 = 5.67kg
Wt of tiles A & B = 13/69 - 5.67 = 8.02kg
# of tiles A & B = 21 - 9 = 12

Guess and check
6A & 6B = (6x0.54) + (6x0.76) = 7.8kg
5A & 7B = (5x0.54) + (7x0.76) = 8.02

5 tile A and 7 tile B

this question is similar to the money question...and the number of legs question (in P3)... no need to use guess and check also can (want to use also can :D)
Tile A- 0.54 kg
Tile B - 0.76kg
Tile C-0.63kg

Kim has a stack of 21 different types of tiles which are made of a combination of Tiles A, B and C. 9 of them are Tiles C and the total mass of 21 tiles is 13.69kg. How many tiles A and B are there respectively?
---------------------------
9 Tile C --> 9x0.63=5.67
(21-9=)12 Tiles (A & B mix) --> 13.69-5.67=8.02

assume all 12 tiles are Tile A\t
--> 12x0.54=6.48\t

Difference --> 8.02-6.48=1.54

difference between Tile A & Tile B
1Tile --> 0.76-0.54=0.22
1.54 divide 0.22 = 7\t
\t
therefore 7\tTile B
and (12-7=) 5Tile A


hope it is clear... (veterans....pls help double check TQ).