Q&A - PSLE Math

[Zhu99]

kiasuaunt:

tianzhu:

[quote=\"jonaandr\"]
3. There were 225 apples and 253 oranges in Box A.
There were 260 apples and 212 oranges in Box B.
Mr Chia moved some apples and oranges from Box B to Box A.
In the end, 40% of the fruits in Box A and 70% of the fruits in Box B were
appoes. How many fruits did Mr Chia move from Box B to Box A?

Hi

Q3 has been discussed before.

Please follow this link.

http://www.kiasuparents.com/kiasu/forum/viewtopic.php&f=69&t=280&p=774807

Best wishes

Hi - I have the same question - sorry, I don't understand the solution. Is there another way of doing it ? Thank you.[/quote]225 + 260 = 485 --- No. of apples
253 + 212 = 465 --- No. of oranges

10 u -- Fruits in A
10 p -- Fruits in B

4 u + 7 p ---> 485 --- Apples

6 u + 3 p ---> 465 --- Oranges
2 u + 1 p ---> 465/3= 155
4 u + 2 p ---> 155 x 2 = 310

7 p - 2 p ---> 485 - 310
5 p ---> 175
10 p --> 175/5 x 10 = 350 --- No. of fruits in B at the end

260 + 212 = 472 --- No. of fruits in B in the beginning

472 - 350 = 122

Mr Chia moved 122 fruits from B to A.

[Shimmer]

1)Ben was given some money. He realised that If he had spent 0.8 cents for each meal, he wOuld have 8 meals fewer if he had spent 0.6 cents per meal.

Ben spent 0.6 cent on 8 meals and spent 0.8 cents on the remaining meals. How many meal did the money last him?

2)Machine P and Q are use to print a book in 5h. When printing a book , P broke down. As a result, it took 7 h to finsh a book. It took Q 8h 20 min to finish printing a book alone.
A. How long P was used before it broke down?
B. How does p take to print a book?

[Shimmer]

1)In a online quiz,30 points are awarded for every correct answer. 10 points are deduct for every wrong answer. Alex has 2570 points for answering 103 questions.

How many questions did Alex answer again?

2)A stall sold 3 kinds of juice. Coconut are at $3,Sugar Cane cost$2 and Guava cost $1.The number of juice sold for 3 data is in a ratio of 3:6:11,find the average cost each bottle sold during 3 days .

3)Owen made 100 sandwich for $100.Chicken are sold for $5 each, fish are sold for $2 and plain are sold for $0.10.How many sandwich did she for each flavor ?

4) A fruit seller had two box of fruits. Each box had mangoes and pears.
The ratio of mangoes tO pear in bOx was 5:4. In box B the number of pear was 2/5 of mangoes. The seller transferred half of the pears in A to B.In the end the fruits in A become 105 and the ratio of mangoes to Pear is 7:4.
A) How many pears were transferred frome A to B?
B)How many fruits are in B in the end?

[Zhu99]

Shimmer:

1)Ben was given some money. He realised that If he had spent 0.8 cents for each meal, he wOuld have 8 meals fewer if he had spent 0.6 cents per meal.

Ben spent 0.6 cent on 8 meals and spent 0.8 cents on the remaining meals. How many meal did the money last him?

0.6 x 8 = 4.8 --- Amt saved from the 8 meals at 0.6 cents

0.8 - 0.6 = 0.2 --- Additional cost of each meal at 0.8 cents

4.8/0.2 = 24 --- No. of meals at 0.8 cents

24 x 0.8 = 19.2 --- Total amt of money

0.6 x 8 = 4.8 --- Amt spent on 8 meals at 0.6 cents

19.2 - 4.8 = 14.4 --- Remaining amt spent at 0.8 cents

14.4/0.8 = 18 --- No. of meals at 0.8 cents

18 + 8 = 26

The money lasted for 26 meals.

Shimmer:

2)Machine P and Q are use to print a book in 5h. When printing a book , P broke down. As a result, it took 7 h to finsh a book. It took Q 8h 20 min to finish printing a book alone.
A. How long P was used before it broke down?
B. How does p take to print a book?

P+Q: 5 h ---> 1 Book
P+Q: 1 h ---> 1/5 Book

Q: 8 1/3 h ---> 1 Book
Q: 1 h ---> 1 x 3/25 = 3/25 Book
Q: 7 h ---> 3/25 x 7 = 21/25 Book

1 - 21/25 = 4/25 Book -- Done by P

P: 1 h ---> 1/5 - 3/25 = 2/25 Book
P: 4/25 Book ---> 1 x 25/2 x 4/25 = 2 h

a) P was used for 2 h.

P: 1 Book --> 1 x 25/2 x 1 = 12 1/2 h

b) It took P 12 1/2 h to print a book (alone).

[zanen]

hello. can someone help me? please help me...both my tuition teachers refuse to...:( some boys sat in a circle. 41 fruit tarts were passed around the boys. alan happened to receive the first and last fruit tarts he received a total of 6fruit tarts. how many boys are there?

[Zhu99]

zanen:

hello. can someone help me? please help me...both my tuition teachers refuse to...:( some boys sat in a circle. 41 fruit tarts were passed around the boys. alan happened to receive the first and last fruit tarts he received a total of 6fruit tarts. how many boys are there?

41 - 1 = 40 --- Disregard the 1st fruit tart Alan received

6 - 1 = 5 --- Number of rounds

40/5 = 8 --- No. of boys

There are 8 boys.

Alan --- 1st, 9th, 17th, 25th, 33th, 41st

[Clairifina]

Hi, can somebody please help with this question? It will be much appreciated. Thank you in advance!


Store X sells an ipad at $660 which is 20% more than the price at store Y. During The Great Singapore Sale, both stores offered the same percentage discount for the iPad. Mr Lee bought the iPad from store Y and paid $104.50 less than the discounted price at store X. What is the percentage discount?

[kiasuaunt]

:thankyou: Zhu99 for your clear explanation. I understand now.

[zanen]

Zhu99:

zanen:

hello. can someone help me? please help me...both my tuition teachers refuse to...:( some boys sat in a circle. 41 fruit tarts were passed around the boys. alan happened to receive the first and last fruit tarts he received a total of 6fruit tarts. how many boys are there?

41 - 1 = 40 --- Disregard the 1st fruit tart Alan received

6 - 1 = 5 --- Number of rounds

40/5 = 8 --- No. of boys

There are 8 boys.

Alan --- 1st, 9th, 17th, 25th, 33th, 41st

may you explain to me why must disregard the lst one by alan?

[nounou]

Hi Tianzhu, can you please explain the following?


146 – (1+2) ------143 (71 and 72)
Why – (1+2)? Why -? Why 1? Why +2? :gloomy:
:udaman: :thankyou:

tianzhu:

Treelodge:

Q15 part 2. Uncle Tianzhu, you have lao hua ah?

Hi

I've to admit I cannot resist the onslaught of old age.

Try to enlarge your images in the future so that we can see better.

The numbers on one side of a sheet adds up to 146.

bi ------21,22 and 51,52

146 – (1+2) ------143 (71 and 72)

Hence number of photos -------- 72

Best wishes