Q&A - P5 Math

[alan000]

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MathAche:

Can anybody provide the model for this problem?


John has 3 times as many stamps as Peter. When John loses 420 stamps and Peter loses 40 stamps, Peter has twice as many stamps as John. How many stamps does each of them have at first?

Dear MathAche,

Hope this helps.

[Easy-going]

Anybody can help me solve this problem sum?


If X gives Y 1/3 of his money, Y willhave $70 more than X. If X gives Y 1/5 of his money, Y will have $10 more than X. How much does each of them have at first?

[MathIzzzFun]

Easy-going:

Anybody can help me solve this problem sum?


If X gives Y 1/3 of his money, Y willhave $70 more than X. If X gives Y 1/5 of his money, Y will have $10 more than X. How much does each of them have at first?

Hi

X --> 15 units
After X gives 1/3 to Y, X --> 10 units, Y ---> 10 units + 70

So, money each has :
X --> 15 units
Y --> 5 units + 70

If X gives 1/5 to Y,
X --> 12 units, Y --> 8 units + 70
8 units + 70 = 12 units + 10 --> 4 units = 60, 1 unit = 15

X --> 15 x $ 15 = $ 225
Y --> 5 x $ 15 + & 70 = $ 145

cheers.

[blueymum]

Thanks Tianzhu for your help. Really appreciated it.



Just wondering if anyone knows how to solve this?

Sam earns 7/9 as much as Andy. Ken’s salary is 1/6 of the total salary of the three men. Ken earns $2560 less than the combined salary of Sam and Andy. What is Sam’s salary?

thanks all!!

[blueymum]

Thanks Tianzhu for your help. Really appreciated it.



Just wondering if anyone knows how to solve this?

Sam earns 7/9 as much as Andy. Ken’s salary is 1/6 of the total salary of the three men. Ken earns $2560 less than the combined salary of Sam and Andy. What is Sam’s salary?

thanks all!!

[MathIzzzFun]

blueymum:

Thanks Tianzhu for your help. Really appreciated it.



Just wondering if anyone knows how to solve this?

Sam earns 7/9 as much as Andy. Ken's salary is 1/6 of the total salary of the three men. Ken earns $2560 less than the combined salary of Sam and Andy. What is Sam's salary?

thanks all!!

Hi

Sam : Andy --> 7 : 9 --> 35u : 45u (total 80u)
Ken : Sam + Andy --> 1 : 5 --> 16u : 80u

80u-16u = 64u --> $ 2560
1u --> $ 40

35u --> 35 x $40 = $ 1400

Sam's salary = $ 1400

cheers.

[MathAche]

thank you both for the answer and model. Cheers.

[blueymum]

Thanks


Just to check how did you derive 35u:45u ?

Appreciate your help.

[MathIzzzFun]

blueymum:

Thanks


Just to check how did you derive 35u:45u ?

Appreciate your help.

Hi
u r welcome

Sam + Andy --> 7 + 9 = 16
Ken's salary : Sam + Andy --> 1: 5
So, need to make Sam + Andy a multiple of 5 and the lowest common multiple of 16 & 5 is 80 ie 16 x 5

cheers.

[blueymum]

Thanks so much.


Was trying this:
Pam’s savings was 3/7 of Mary’s savings.
Jan’s savings was 2/5 of the total savings of the three children.
Pam and Mary have $240 more than jan.
How much is pam’s savings?

P:S —> 3:7
J: P+ S—> 2:4

Is this right? And how do I do the next step?

Thanks !!