Q&A - P5 Math

[MathIzzzFun]

blueymum:

Dear all


Would need help with these questions:

A baker has some flour. He uses an equal amount of flour to bake cakes everyday. After 6 days, he has 3/5 of the flour left. After another 4 days,he has 15kg of flour left. How much flour did he have at first?


Mary spent 1/4 of her money on shoes, 1/6 of the remainder on present and $45 on a blouse and had $80 left. How much money did she have at first?

Thanks all!!

Hi

Q1.
Total amount of flour at first --> 15 units
2/5 used in 6 days --> 2/5 x 15 units = 6 units
1 day --> 1 unit
4 days --> 4 units
Amount of flour left in the end --> 15 -6-4 units = 5 units
5 units --> 15 kg, 1 unit --> 3 kg
Amount of flour at first = 15 x 3 kg = 45 kg

Q2.
5/6 of remainder --> $45 + $ 80 = $ 125
remainder --> 6/5 x $ 125 = $ 150 --> 3/4 of Mary's money at first
Mary's money at first = 4/3 x $ 150 = $200

cheers.

[Cpy2001]

Help :roll:


Daniel has $160 more then Raja. If Daniel gives Raja 1/10 of his money, he will have 3 times as much money as Raja.

A) how much money dose Raja have at 1st?
B) express Raja's money as a fraction of Daniel's money


Thanks

[tianzhu]

Cpy2001:

Help :roll:


Daniel has $160 more then Raja. If Daniel gives Raja 1/10 of his money, he will have 3 times as much money as Raja.

A) how much money dose Raja have at 1st?
B) express Raja's money as a fraction of Daniel's money


Thanks

Hi

You may use MD.

Before
Daniel ------ 10 units + 160
Raja ------ 10 units

After
Daniel ------ 9 units + 144
Raja ------ 11 units + 16

11 units + 16
(x3)
33 units + 48

33 units + 48 --------- 9 units + 144

24 units ------ 96
1 unit ------- 4

Raja ------ 10 units -------10*4 ------ 40

Daniel ------ 10 units + 160 ------- 200

Raja's money as a fraction of Daniel's money ------ 40/200 ------1/5

Best wishes

[Cpy2001]

Thanks!

[blueymum]

Thanks once again.


May I know how did u derive 15 units?

For the second question, I was able to solve with model but when I used the branching method, I could not. Would u be able to do it via that method?

Thanks!!

4/4 -- 1/4 shoes
-- 3/4 remainder -- 1/6
-- 5/6 5/6x3/4= 15/24

15u --> 125?

[MathIzzzFun]

blueymum:

Thanks once again.


May I know how did u derive 15 units?

For the second question, I was able to solve with model but when I used the branching method, I could not. Would u be able to do it via that method?

Thanks!!

4/4 -- 1/4 shoes
-- 3/4 remainder -- 1/6
-- 5/6 5/6x3/4= 15/24

15u --> 125?

Hi

2/5 of flour in 6 days --> 6/15 of flour in 6 days

For Q2...

15/24 of money ---> $ 125
Total amount of money --> $ 125 / 15 x 24 = $ 200

cheers.

[yxl]

Q1)Kenny bought two bags of rice, X and Y. The two bags contained diferent

amounts of rice which had a total mass of 90kg. Kenny poured 1/4 of the
rice from Bag X into Bag Y. After that, he poured 2/5 of the rice from
Bag Y into Bag x. He found that both bags had the same mass now.
How much rice was ther in Bag y at the beginning?


Q2) Marcus earns $350 less than Terry every month. They each spend $800
every month and save the rest of their money.

a) How long does it take for marcus to save $2100 and for Terry to save
$4550.

b) What is Marcus’s monthly salary?

[YumYum]

Hi, need help with this Qn:


This year, Inez, is 4 times as old as her son.

In 15 years’ time, Inez’s age will be 3 years more than twice her son’s age.

How old was Inez 8 years ago?

Thanks.

[Raider]

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[YumYum]

Raider, thank you!