Q&A - P5 Math

[tianzhu]

Class2112:

Hi


Need help with the question below:

The volume of water in bottle P was 3/5 of that in bottle Q. After 60ml of water was added to bottle P and 20ml was poured away from bottle Q, the amount of water in bottle P was 3/4 that in bottle Q. What was the amount in each bottle at first?

Thanks

Hi

You may use “Units and Parts”

At first

Bottle P:Bottle Q ------- 3 units:5 units

Change

Bottle P:Bottle Q ------- +60:-20

In the end

Bottle P:Bottle Q ------- 3 parts:4 parts

3 units + 60 ------ 3 parts
(x4)
12 units + 240 ------- 12 parts

5 units – 20 -------- 4 parts
(x3)
15 units – 60 ------- 12 parts

Equalizing the parts

12 units + 240 ----- 15 units – 60

1 unit ------- 100

Bottle P ------- 300ml

Bottle Q ------- 500ml

Best wishes

[tianzhu]

S6169:

Hi, Need some help,

Andy and Betty saved a fixed amount every day. Betty, who started saving earlier, saved $4 each day. By the 10th dayof Betty's savings, Andy had saved $18. By the 16th day of Betty's savings, Andy had saved $54.
(a) Find the ratio of Andy's savings to Betty's savings. (leave your answer in the simplest form)
(b) On which day of Betty's savings will Andy save the same amount as Betty? RGS SA1 2011

Question (b) is ask about on which day of Betty's savings when they saved the same amount of money or how much is the same amount? Confused by the answer sheet. :? Thanks a lot!

Hi

It is the 5th day after day 16 which is day 21.

Best wishes

[MathIzzzFun]

zeemimi:

There are some crystal and glass marbles in a pouch. If 3 crystal marbles are removed from the pouch, the number of crystal marbles left will be 1/6 of the glass marbles left. If 5 glass marbles are removed from the pouch, the number of crystal marbles left will be 1/4 of the glass marbles left. How many marbles are there in the pouch at first? ACS paper 2 2011.

Hi

this was discussed earlier - http://www.kiasuparents.com/kiasu/forum/viewtopic.php?f=68&t=25129&start=820

cheers.

[zeemimi]

MathIzzzFun:

zeemimi:

There are some crystal and glass marbles in a pouch. If 3 crystal marbles are removed from the pouch, the number of crystal marbles left will be 1/6 of the glass marbles left. If 5 glass marbles are removed from the pouch, the number of crystal marbles left will be 1/4 of the glass marbles left. How many marbles are there in the pouch at first? ACS paper 2 2011.

Hi

this was discussed earlier - http://www.kiasuparents.com/kiasu/forum/viewtopic.php?f=68&t=25129&start=820

cheers.

Thanks! I thought so too there was something wrong with the question.

[zeemimi]

*deleted * double post

[S6169]

tianzhu:

S6169:

Hi, Need some help,

Andy and Betty saved a fixed amount every day. Betty, who started saving earlier, saved $4 each day. By the 10th dayof Betty's savings, Andy had saved $18. By the 16th day of Betty's savings, Andy had saved $54.
(a) Find the ratio of Andy's savings to Betty's savings. (leave your answer in the simplest form)
(b) On which day of Betty's savings will Andy save the same amount as Betty? RGS SA1 2011

Question (b) is ask about on which day of Betty's savings when they saved the same amount of money or how much is the same amount? Confused by the answer sheet. :? Thanks a lot!

Hi

It is the 5th day after day 16 which is day 21.

Best wishes

Thank you so much. The answer in the answer sheet is 84 which is the amount of money on the 21th day of the Betty's saving.

[zckenny]

Mark’s current age is 1/4 of Ronald’s. In 24 years’ time, Ronald’s age will be 14 years less than twice Mark’s age. What is Ronald’s age now?

[YumYum]

Hi, need help with this qn:


Three sisters Lisa, Ming and Nora shared the cost of a present for their father. Lisa paid 1/4 of the total share of Ming and Nora. Ming paid 1/9 of the total share of Lisa and Nora. Nora paid $60 more than Ning. How much did the present cost?

Thanks

[small]

zckenny:

Mark's current age is 1/4 of Ronald's. In 24 years' time, Ronald's age will be 14 years less than twice Mark's age. What is Ronald's age now?

Hi,

Someone posted this question before.

http://www.kiasuparents.com/kiasu/forum/viewtopic.php&f=68&t=33165&p=729796

[small]

YumYum:

Hi, need help with this qn:


Three sisters Lisa, Ming and Nora shared the cost of a present for their father. Lisa paid 1/4 of the total share of Ming and Nora. Ming paid 1/9 of the total share of Lisa and Nora. Nora paid $60 more than Ning. How much did the present cost?

Thanks

Hi YumYum,

Please refer to the following link.

http://www.kiasuparents.com/kiasu/forum/viewtopic.php&f=68&t=35175&p=754627