Tutor MathsGuru: Ask me for your burning Maths questions!

[Dharma]

Vikaesh:

PLEASE HELP:


Express 3969 as a product of its prime factors and give your answer in index notation.

3969 = 3 X 3 X 3 X 3 X 7 X 7 = 3^4 X 7^2

[Dharma]

Vikaesh:

please explain to me what is an index notation and how the prime factors can be found out...

Check this website http://www.hi.com.au/mathszoneqld/pdf/MZQSA01b.pdf

[kiasimom]

Hi mathsguru,


Need your help on this.

Daisy had twice as many pencils as Sulin at first. Then Rose gave 8 pencils to Sulin. After that, Rose had three times as many pencils as Sulin. If Daisy, Sulin and Rose had 134 pencils altogether, how many more pencils than Daisy did Rose have at first?

Many thanks.

[mathsguru]

kiasimom:

Daisy had twice as many pencils as Sulin at first. Then Rose gave 8 pencils to Sulin. After that, Rose had three times as many pencils as Sulin. If Daisy, Sulin and Rose had 134 pencils altogether, how many more pencils than Daisy did Rose have at first?

Hi Kiasimom,

Here's my solution. To get started, try drawing 2 models representing Daisy and Sulin's pencils. Then, add on to Sulin's model by including the 8 pencils Rose gave her. From there, we can draw out Rose's model and solve accordingly.

http://www.postimage.org/image.php?v=Pq1NChxi

Cheers,
MathsGuru

[kiasimom]

:thankyou:

I finally figured it out!! :celebrate:

[mathsguru]

Vikaesh:

What is


3a(2a - 1) - 2a(2 - 4a) = ? in the simplest form ? [please show step-by-step working...tks]

Hi Vikaesh,

3a(2a - 1) - 2a(2 - 4a)
= 3a x 2a - 3a x 1 - 2a x 2 + 2a x 4a
= 6a^2 - 3a - 4a + 8a^2
= 14a^2 - 7a
= 7a(2a-1)

I believe this is lower sec maths - algebraic expansion & factorisation.

Remember that: -ve • -ve = +ve. And \"simplest form\" usually requires u to factorise the expression to get the final answer.

Regards,
MathsGuru

[kitty2]

Hi Mathsguru.,please help :?: Thanks


1) There were 30 balls in pails P,Q and R.Six balls from pail P were put into pail Q.Then 4 balls from pail Q were put into pail R.There were the same number of balls in each pail in the end.How many balls were there in each pail at first?

2)When Belinda purchased 6kg of rice,she was short of $6.When she purchased 8kg of the same type of rice,she was short of $14.How much money did she have?

3)Greg went shopping with $360.he bought some calculators and shirts and had $8.50 left.Each shirt cost $15.50 more than a calculator.He bought 3 fewer calculators than shirts.How many shirts and how many calculators did he buy if each calculator cost $17.50?

4)An Iron bar was cut into 3 equal parts,A,B and C.1/2 of A,3/8 of b and 1/3 of C had a mass of 58kg.What was the original mass of iron bar?

5)If Li ming gives Dave $8 both of them will have the same amount of money.If Florence adds $14 to Liming's original sum of money,the ratio of Liming's money to Dave's original sum of money will be 5:2.How much money has Li ming at first?

[kitty2]

Vikaesh:

Hope this helps for Qn 1:



http://www.postimage.org/image.php?v=TsDhCN9

Hope this helps for Qn 2:


http://www.postimage.org/image.php?v=Pq1VyfXi

Thank you

[mathsguru]

kitty2:

1) There were 30 balls in pails P,Q and R.Six balls from pail P were put into pail Q.Then 4 balls from pail Q were put into pail R.There were the same number of balls in each pail in the end.How many balls were there in each pail at first?


2)When Belinda purchased 6kg of rice,she was short of $6.When she purchased 8kg of the same type of rice,she was short of $14.How much money did she have?

3)Greg went shopping with $360.he bought some calculators and shirts and had $8.50 left.Each shirt cost $15.50 more than a calculator.He bought 3 fewer calculators than shirts.How many shirts and how many calculators did he buy if each calculator cost $17.50?

4)An Iron bar was cut into 3 equal parts,A,B and C.1/2 of A,3/8 of b and 1/3 of C had a mass of 58kg.What was the original mass of iron bar?

5)If Li ming gives Dave $8 both of them will have the same amount of money.If Florence adds $14 to Liming's original sum of money,the ratio of Liming's money to Dave's original sum of money will be 5:2.How much money has Li ming at first?

Hi Kitty2,

Here are my solutions. Hope they'll help your child!

http://www.postimage.org/image.php?v=aV1GhBz9

http://www.postimage.org/image.php?v=aV1GhGyr

http://www.postimage.org/image.php?v=aV1GhJ2A

http://www.postimage.org/image.php?v=aV1GhLxJ

http://www.postimage.org/image.php?v=aV1Ghu4J

Cheers,
MathsGuru

[rubydoll]

Hi

Please help me to solve this.

Jim bought some chocolates and gave half of it to ken. ken bought some sweets ans gave half of it to jim. Jim ate 12 sweets and ken ate 18 chocolates. The ratio of jims sweets to chocolates became 1:7 and the ratio of kens sweets to chocolates became 1:4. How many sweets did ken buy?
Thank you