Q&A - P3 Math

[MathIzzzFun]

chloecube:

MathIzzzFun:

[quote=\"chloecube\"]hi all,


i need some expert help on these 2 sums :thankyou:

1) A number is a multiple of 3. It is between 10 and 40. It is also a factor of 45. What is the number?

is the answer : 15?

2) There are 943 apples in Box X and Box Y. There are 785 apples in Box Y and Box Z. How many apples are there in Box X than in Box Z?

Hi

1) yes.

2)
[Box Y][**Box X**] = 943
[Box Y][*Box Z*] = 785
So [**Box X**] - [*Box Z*] = 943 - 785 = 158
There were 158 more apples in Box X than in Box Z.

cheers.

thks MathIzzzFun

u have made Q2 looks so easy...and i feel so stupid... :oops:[/quote]Hi chloecube,

am glad to help.. we all are learning - step by step..

cheers.

[pinball]

Hi,


Need help with the following question

A truck carries newspaper. When it is half full of newspaper the truck has a mass of 1762kg. When it is quarter full the truck has a mass of 1426kg. What is the mass of the truck when it is full of newspaper?

[MathIzzzFun]

pinball:

Hi,


Need help with the following question

A truck carries newspaper. When it is half full of newspaper the truck has a mass of 1762kg. When it is quarter full the truck has a mass of 1426kg. What is the mass of the truck when it is full of newspaper?

Hi

[mass of truck][1/2 load] = 1762 kg
[mass of truck][1/4 load] = 1426 kg
so, [1/4 load] = 1762 -1426 = 336 kg,

[mass of truck][full load] = [mass of truck][1/2 load] + [1/2 load] = 1762 + 336 x 2 = 2434 kg

Mass of truck with full load of newspapers = 2434 kg

cheers.

[pinball]

Thanks

[Jenlimtz]

Hi


Pls help:

There were 420 more marbles in box A than box B. When 150 marbles was transferred from box B to box A. There were 4 times as many marbles in box A as box B.
a) How many marbles are there in box B now?
b) How many marbles were there in box A at first?

TIA.

[chloecube]

Hi chloecube,


am glad to help.. we all are learning - step by step..

cheers.[/quote]

thank you.
i met with another difficult sum :scratchhead:

3 similar rings and 2 similar chains cost $1200
2 similar rings and 1 similar chain cost $750
Find out the cost of 1 ring.

[lizawa]

chloecube:

3 similar rings and 2 similar chains cost $1200
2 similar rings and 1 similar chain cost $750
Find out the cost of 1 ring.

2 rings + 1 chain = $750
4 rings + 2 chains = $1500
3 rings + 2 chains = $1200 (given)
1 ring = $1500 - $1200 = $300

[lizawa]

Jenlimtz:

Hi


Pls help:

There were 420 more marbles in box A than box B. When 150 marbles was transferred from box B to box A. There were 4 times as many marbles in box A as box B.
a) How many marbles are there in box B now?
b) How many marbles were there in box A at first?

TIA.

Solution :
http://i52.tinypic.com/21j9890.jpg\">

[chloecube]

lizawa:

chloecube:

3 similar rings and 2 similar chains cost $1200
2 similar rings and 1 similar chain cost $750
Find out the cost of 1 ring.

2 rings + 1 chain = $750
4 rings + 2 chains = $1500
3 rings + 2 chains = $1200 (given)
1 ring = $1500 - $1200 = $300

:thankyou:

[chloecube]

lizawa:

Jenlimtz:

Hi


Pls help:

There were 420 more marbles in box A than box B. When 150 marbles was transferred from box B to box A. There were 4 times as many marbles in box A as box B.
a) How many marbles are there in box B now?
b) How many marbles were there in box A at first?

TIA.

Solution :
http://i52.tinypic.com/21j9890.jpg\">

sorry, i am not good in Math, correct me if i am wrong.

lizawa method is right, but why must add 150 two times in the 2nd model?

3units = 420 + 150 = 570
1 unit = 190
Box B has 190 marble

Box A has 190+150+420 = 760 marbles at first.