Q&A - P4 Math

[MathIzzzFun]

AgonyMum:

Hi,can anyone show me the proper working for these Fractions questions.

TIA!

1) Doreen is 3 times as old as her daughter now. If her daughter's age is 2/3 of her age in 30 years' time, how old is Doreen now?

Hi


for questions on age, the key concept is \"same gap/difference\" since age difference/gap remains the same.

Now,
Doreen's age --> 3 units }
Daughter's age --> 1 unit } (gap 2 units)

In 30 years' time,
Daughter's age = 2/3 Doreen's age = 4/6 Doreen's age (gap of 2)
ie
Doreen's age --> 6 units
Daughter's age --> 4 units

So, 6 units - 3 units = 30 years
1 unit --> 10 years, 3 units --> 30

Doreen is 30 years old now.

You can replace the units with blocks for MD.

cheers.

[MathIzzzFun]

AgonyMum:

Hi,can anyone show me the proper working for these Fractions questions.

TIA!



2) Winnie, Xavier and Yonda had a total of $407.50. Xavier had $20 lesss than Yonda.Yonda ahd 2/5 the amount of money Winnie had. How much money did Xavier have?

Hi

Winnie --> 5 units
Yonda --> 2 units
Xavier --> 2 units - $20
Total : 9 units - $ 20 = $407.50
1 unit --> $47.50
Xavier --> $75

For MD, replace the units with blocks.

cheers.

[MathIzzzFun]

AgonyMum:

Hi,can anyone show me the proper working for these Fractions questions.

TIA!

3) The total mass of Johnny and Alex was 180kg.After going through a weight-loss prog, Johnny lost 2/5 of this original mass while Alex lost 20 kg. They have the same mass now. What was Alex's mass before he joined the prog?

After weight loss,

Johnny ---> 3 units
Alex ---> 3 units

Before weight loss,
Johnny --> 5 units
Alex --> 3 units + 20

Total : 8 units + 20 = 180
1 unit --> 20

Alex's original weight --> 80 kg

For MD, replace the units with blocks.

cheers.

[AgonyMum]

Hi MathIzzzFun,

Good morning to you!
Thanks so much for your solution and prompt assistance
You are a gem

[Thein]

http://i50.tinypic.com/2sakvpj.jpg\">

[AgonyMum]

Hi Thein,

Thanks so much for providing the solution in MD and algebra
I have shown it to my child and he understood immediately.
My son has asked me to send :hugs: and :snuggles: to all the helpful souls in this forum.

[Thein]

Hi Agonymom

You are most welcome

[Michaelia0816]

In 5 795-395=10000-a,what is the value of a?

[Michaelia0816]

Jennifer has some cubes.her number of cubes is more than 20 but less than 40.if she puts them into packets of 6,there will be 1 cube left. If she puts them into Packets of 7, there are 3 cubes left. How many cubes does jennifer have?

[Thein]

[quote]Jennifer has some cubes.her number of cubes is more than 20 but less than 40.if she puts them into packets of 6,there will be 1 cube left. If she puts them into Packets of 7, there are 3 cubes left. How many cubes does jennifer have?
[/quote] Since number of cubes is more than 20 but less than 40


http://i50.tinypic.com/ilg4cx.jpg\">

Hence the number of cubes Jennifer has is 31