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Primary 4 | Maths
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sachin
Sachin

Primary 4 chevron_right Maths chevron_right Singapore

pls help

Date Posted: 5 months ago
Views: 57
J
J
5 months ago
No. It should be 403 + 268 + 268
= 939
sachin
Sachin
5 months ago
In the answer it is mentioned as 939 ,but I am not sure how it will be ? can anyone explain ?
snell
Snell
5 months ago
thanks J for the correction! :)
snell
Snell
5 months ago
left out the shortfall in LW

before.
LW: u
A: u+403

after,
LW: u-268
A: u+403+268 = u+671

difference = u+671 - (u-268)
= 939
sachin
Sachin
5 months ago
Thanks a lot
J
J
5 months ago
Welcome Snell


Sachin : The who has more stamps received even more stamps, but the one who has less stamps now has even fewer stamps. now lost some stamps. So the difference increases by twice the number of stamps given.


For example,


You have $10, I have $5. Difference is $5

I decide to give you $3.

Now you have $13 while I have only $2 left. My amount decreases by $3, yours increases by $3. So the difference increases by $3 + $3 = $6

$5 + $3 + $3 = $11

Check : Difference now = $13 - $2 = $11
J
J
5 months ago
However if the opposite happens, the difference decreases by twice the amount of stamps given.


For example,


You have $10, I have $5. Difference is $5

You decide to give me $2

Now you have $8 left while I have $7. My amount increases by $2, yours decreases by $2. So the difference dcreases by $2 + $2 = $4

$5 - $2 - $2 = $1

Check : Difference now = $8 - $7 = $1

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Yasmin
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