Q&A - P3 Math
-
ben is an office boy who works in a building where every floor has a lift
his routine begins when he leaves his office and takes the lift 9 floors up to Mr Tan’s office. He then goes to Mrs Wong’'s office 5 floors below Mr Tan’s office to collect a parcel.
Next, he takes the lift 15 floors up to hand the parcel to Miss Lee. After that, he takes the lift 20 floors down back to the first floor. On which floor is Ben’s office located?
is the answer 1st or 2nd floor?
is Miss Lee on 20th floor, Mr Tan on 10th floor and Mrs Wong on 5th floor? -
24hr-mum:
This is my interpretation:ben is an office boy who works in a building where every floor has a lift
his routine begins when he leaves his office and takes the lift 9 floors up to Mr Tan's office. He then goes to Mrs Wong''s office 5 floors below Mr Tan's office to collect a parcel.
Next, he takes the lift 15 floors up to hand the parcel to Miss Lee. After that, he takes the lift 20 floors down back to the first floor. On which floor is Ben's office located?
is the answer 1st or 2nd floor?
is Miss Lee on 20th floor, Mr Tan on 10th floor and Mrs Wong on 5th floor?
Working backwards:
he takes the lift 20 floors down back to the first floor.
This means that he was on the 21st floor before he went back to the first floor. Miss Lee's office is on the 21st floor.
he takes the lift 15 floors up to hand the parcel to Miss Lee
This means that he was on the 6th floor. Mrs Wong's office is on the 6th floor.
He then goes to Mrs Wong''s office 5 floors below Mr Tan's office to collect a parcel.
This means that he was on the 11th floor. Mr Tan's office is on the 11th floor.
he leaves his office and takes the lift 9 floors up to Mr Tan's office.
This means that he was on the 2nd floor. His office is on the 2nd floor.
I was wondering about the first step and thinking, should it be 20th floor or 21st floor since the question says '20 floors back down'.
Then I thought: If I'm on the 2nd floor and I go 1 floor back down, I would be on the first floor.
Which means that if I'm on the 20th floor and I go 20 floors back down, I won't be at the 1st floor. I'll be at B1.
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this is a sch hmwk. the teacher’s answer is 2nd flr.
how to present the answer? draw a number line? -
Hi, for such questions normally we draw a diagram something like this:
– 20
– 19
– 18
– 17
– 16
– 15
– 14
– 13
– 12
– 11
– 10
– 9
– 8
– 7
– 6
– 5
– 4
– 3
– 2
– 1
Then you can use labelled arrows to show the movement (20 floors down, etc). -
wow, hope the teacher wont set questions with 50 floors!
-
hi all.
I need help with my son's P3 Q from past year exam papers 2010
A skirt & a dress cost $155
A skirt & a pair of pants costs $95
A skirt, a dress and a pair of pants cost $300
How much is the skirt?
The answer was $50.
But i was wondering if the skirt is $50, when i add up the rest it does not tally to $300?.. hmn..
Would appreciate if any one can help with this. Thanks much! -
It's because the last question is wrong
A skirt, a dress and a pair of pants should cost $200
Then you will get the skirt at 50
155 + pants = 200--> pants = 45
skirt + pants = 95-->skirt = 50paranoid mum:
hi all.
I need help with my son's P3 Q from past year exam papers 2010
A skirt & a dress cost $155
A skirt & a pair of pants costs $95
A skirt, a dress and a pair of pants cost $300
How much is the skirt?
The answer was $50.
But i was wondering if the skirt is $50, when i add up the rest it does not tally to $300?.. hmn..
Would appreciate if any one can help with this. Thanks much! -
24hr-mum:
Working backwardsben is an office boy who works in a building where every floor has a lift
his routine begins when he leaves his office and takes the lift 9 floors up to Mr Tan's office. He then goes to Mrs Wong''s office 5 floors below Mr Tan's office to collect a parcel.
Next, he takes the lift 15 floors up to hand the parcel to Miss Lee. After that, he takes the lift 20 floors down back to the first floor. On which floor is Ben's office located?
is the answer 1st or 2nd floor?
is Miss Lee on 20th floor, Mr Tan on 10th floor and Mrs Wong on 5th floor?
1 + 20 – 15 + 5 – 9 = 2
Ben’s office is on the 2nd floor -
thanks!
this made it much easier to understand -
A+B+C=37
A+B+B=32
A+A+B=28
what is C?
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