Q&A - PSLE Math

[ChiefKiasu]

mathsparks:

I've a question on calculation of carpark charges. A man drives his car into carpark A at 4:30pm and leaves at 6:30pm. How much does he have to pay if the carpark charges $1 an hour or part thereof and $3 per entry after 5pm.


The answer could either be:
1) $1 (first half hr) + $3 (per entry) = $4

or
2) $1x2 (2 hrs) = $2

Since different carparks in SG calculate differently, both answers should be accepted.

Any comments?

This is a business modeling question, not a PSLE math problem :lol:

The first answer is correct. It's 4 bucks, baby, and I think it's pretty much the same answer all over Singapore .

[mathsparks]

Exactly chief. It should not be a psle qn. One of the 2007 top school papers has a similar qn. To quote my experience in United Sq carpark.


I park there from 4:50 till around 7:20pm. I couldn’t figure out how the charges came up to 5+.

So now I park from 4:50 till 6:50pm and wait for my kid outside the building and the charges comes up to 3+. Econ. crisis. Penny pinching.

So I think united sq charges is a combination of ans 1 and 2.

[mathsparks]

1 more qn. and possibly many more from me in the run up to psle. thanks for helping!


From Henry Park P6 SA1 2007

Ans is 360.

http://farm4.static.flickr.com/3617/3525348926_e2cf9bb25f_b.jpg\">

[small]

Hope this help, please correct me if I was wrong.

a) 11:30am to 3:30pm = 4 hours

Van was 80 km/hour
4 x 80 = 320 km

Van was 320 km from t=Town X

b) truck started 2 hours later which was 1:30pm

1:30pm to 3:30pm = 2 hours

Truck was 54 km/hour
2 x 54 = 108 km

At 3:30 pm:
Van was (350-320)km = 30km away to Town Y
Truck was 108 km away from Town Y

108 – 30 = 78 km

So the distance between the van and the truck at 3:30 pm was 108 km

[Vanilla Cake]

small:

Hope this help, please correct me if I was wrong.

a) 11:30am to 3:30pm = 4 hours

Van was 80 km/hour
4 x 80 = 320 km

Van was 320 km from t=Town X

b) truck started 2 hours later which was 1:30pm

1:30pm to 3:30pm = 2 hours

Truck was 54 km/hour
2 x 54 = 108 km

At 3:30 pm:
Van was (350-320)km = 30km away to Town Y
Truck was 108 km away from Town Y

108 – 30 = 78 km

So the distance between the van and the truck at 3:30 pm was 108 km

(a) 320 km

(b)Distance that the truck had travelled-> 54 X 2 = 108 km
Distance between the truck and van-> (108+320)-350
= 428-350
= 78 km

[mathsparks]

Thanks vanilla cake and small for your help. Realise i typed the wrong answer. For (a) it should be 320km and (b) 78km.


Thanks. I've one more question. Ans is 360.
http://farm4.static.flickr.com/3654/3525605596_a43c5698aa_o.png\">

[Vanilla Cake]

mathsparks:

Thanks vanilla cake and small for your help. Realise i typed the wrong answer. For (a) it should be 320km and (b) 78km.


Thanks. I've one more question. Ans is 360.
http://farm4.static.flickr.com/3654/3525605596_a43c5698aa_o.png\">

Hi Mathsparks,
Yr qn and solution can be found in this http://prischoolmaths.blogspot.com/search/label/Maths-Percentage
Reference : Maths - Percentage dated 8 Feb 2009.

Hope this helps.

[mathsparks]

Thanks so much vanilla cake for your help. I often wonder where you find so much time to help us ksps when you're busy with school work yourself. All these should contribute to CIP for you. :lol:

Maybe you should ask chief to write you a glowing testimony on behalf of us.

[tianzhu]

Maths Questions from CNA forum.

http://www.channelnewsasia.com/discussion/forum.htm

1. Courier A takes 10 hours to deliver a parcel from Town X to Town Y. Courier B takes 12 hours to deliver the parcel along the same route. If the speed of Courier A is 9km/h faster than that of Courier B, find the speed of Courier A.


2. There were some apples at a fruit stall. In the morning, the number of apples sold was 2/5 of the apples left. In the afternoon, another 44 apples were sold. The total number of apples sold was 6 less than 9/14 of the number apples the fruit stall had at first. How many apples were there at first?


3. In a grooming workshop organised by the school, 75% of the pupils participated were girls. 49 girls and 3 boys quitted halfway and went home. The remaining pupils were organised into groups of 10 for group discussion. There were 3 boys in each group. How many pupils participated in the grooming workshop at first?


4. There were some apples and oranges in a box. 80% of the fruits in the box were apples. Ali sold 63 apples and 9 oranges. He packed the remaining fruits into packets of 12 apples and oranges. Each packet of fruits has 3 oranges. Find the total number of oranges Ali had at first.


5. When Mrs Lee was 40 years old, her son was twice her daughter's age. Mrs Lee will be twice her son's age when her daughter is 28 years old. How old will Mrs Lee be when her daughter is 20 years old?


6. In a concert, 75% of the audience were female. 75 females and 5 males left the concert half way. The remaining audience were allocated seats in groups of 10. Each group has 3 males. How many people were in the audience at first?


7. Tom wants to complete a jigsaw puzzle. On the first day, he fitted 20% of the puzzle. On the second day he fitted another 60 pieces. The ratio of fitted to non-fitted pieces is now 2:5. How many pieces are there in the jigsaw puzzle?


8. Shop X sells a watch for $2400 which is 25% less than what Shop Y sells. During a sale, both shops offer an equal percentage discount. Mr Lee bought the watch in Shop Y and paid $520 more than the discounted price in Shop X. What is the percentage discount given by both shops?


9. The ratio of Ryan's pocket money to John's pocket money was 3 : 2. After Ryan saved $15 and John spent $8, the ratio of Ryan's pocket money to John's pocket money was 3 : 1. How much money did Ryan have at first?


10. John had $228 and Kevin had $204. Kevin spent thrice as much as John. If John had thrice as much money as Kevin after spending, how much did Kevin spend?

[mummyjoyce]

Vanilla Cake:

mathsparks:

Thanks vanilla cake and small for your help. Realise i typed the wrong answer. For (a) it should be 320km and (b) 78km.


Thanks. I've one more question. Ans is 360.
http://farm4.static.flickr.com/3654/3525605596_a43c5698aa_o.png\">

Hi Mathsparks,
Yr qn and solution can be found in this http://prischoolmaths.blogspot.com/search/label/Maths-Percentage
Reference : Maths - Percentage dated 8 Feb 2009.

Hope this helps.

Hi Vanilla Cake,
Just want to thank you for send this link; all the Math questions are good. I have printed out all the questions/answers and compiled into a booklet for my girl as reference.

You rock!