Q&A - PSLE Math

[Pinkyma]

Hi everyone, I am having trouble solving my daughter’s P6 math questions and need help from all you experts. Here r the questions:


1) how many odd numbers are there in this sequence : 1, 1, 2, 3, 5, 8, 13, …, 1000.

2) tanks E and F contain different volume of oil. Some oil from E was poured into F and the volume of oil in F was doubled. Then some oil from F was poured into E and the volume of oil in tank E was doubled. Both tanks now contain 19 litres of oil. What was the volume of oil in tanks E and F at first?

Thanks in advance!

[CoffeeCat]

Pinkyma:

Hi everyone, I am having trouble solving my daughter's P6 math questions and need help from all you experts. Here r the questions:


1) how many odd numbers are there in this sequence : 1, 1, 2, 3, 5, 8, 13, ..., 1000.

2) tanks E and F contain different volume of oil. Some oil from E was poured into F and the volume of oil in F was doubled. Then some oil from F was poured into E and the volume of oil in tank E was doubled. Both tanks now contain 19 litres of oil. What was the volume of oil in tanks E and F at first?

Thanks in advance!

the first is a famous sequence in maths called fibonacci sequence. starting from the 3rd term onwards, every term is produced by adding the previous 2 terms.

[tianzhu]

Hi

Hope this helps.

http://farm4.static.flickr.com/3310/4584911145_455a61c725.jpg\">


http://farm5.static.flickr.com/4052/4584922081_4b93b008c6.jpg\">

Best wishes

[Pinkyma]

Thank you so much Tianzhu and Coffeecat.

[ruyu]

question that appeared from my exam i am remembering this with my best ability!


Names differ


Tom had $200 more than Harry. In the afternoon, Tom gave some money to Harry. The ratio to the amount he had left to the amount he gave away is 2:3. In the evening, Harry gave some money to Tom. The ratio of the amount he had left to the amount he gay away is 3:1. In the end, Harry had $200 more than Tom. How much did Tom have at first?

one more question , can you please check if there is a mistake my friends and i could not even get the answer! UNDOABLE!

Tom and Harry bought some cartons of soya bean drink and herbal tea. Tom bought 3/8 of the cartons. Both of them bought 48 more cartons of soya bean drink than herbal tea. Harry bought 2/5 of the soya bean drink and 1/2 of the herbal tea. How many cartons did Tom buy?

Thanks for your help!

[HyperKiasu]

for Q1 it is solvable. but duno whether algebra is allowed for P6 exam.


In the morning, Tom has $750, Harry has $550
Tom gave away $450 to Harry, and Harry gave back $$250 to Tom.

check:

Tom: (750-450)/450 =2/3
Harry: (550+450-250)/250 = 3
in the morning:
750-550 =200, Tom has $200 more than Harry
In the afternoon:
Harry 550+450-250 = 750
Tom 750-450+250 = 550
Harry has $200 more than Tom

[ruyu]

HyperKiasu:

Tom has $1750, he gave away $1050 to Harry

Harry has $1550 at first, and he gave $650 back to Tom.
check:
(1750-1050)/1050 = 2/3
(1550+1050-650)/650 = 3

it is solvable. but i use algebra to solve it. duno whether it is allowed for your exam?

but vanilla cake ans 750? the second question doable?

[ruyu]

question that appeared from my exam i am remembering this with my best ability!


Names differ


Tom had $200 more than Harry. In the afternoon, Tom gave some money to Harry. The ratio to the amount he had left to the amount he gave away is 2:3. In the evening, Harry gave some money to Tom. The ratio of the amount he had left to the amount he gay away is 3:1. In the end, Harry had $200 more than Tom. How much did Tom have at first?

one more question , can you please check if there is a mistake my friends and i could not even get the answer! UNDOABLE!

Tom and Harry bought some cartons of soya bean drink and herbal tea. Tom bought 3/8 of the cartons. Both of them bought 48 more cartons of soya bean drink than herbal tea. Harry bought 2/5 of the soya bean drink and 1/2 of the herbal tea. How many cartons did Tom buy?

Thanks for your help!

[HyperKiasu]

ruyu:

HyperKiasu:

Tom has $1750, he gave away $1050 to Harry

Harry has $1550 at first, and he gave $650 back to Tom.
check:
(1750-1050)/1050 = 2/3
(1550+1050-650)/650 = 3

it is solvable. but i use algebra to solve it. duno whether it is allowed for your exam?

but vanilla cake ans 750? the second question doable?

sorry, i made an error when i did initially.... please see my new post...

[mathsparks]

ruyu, you’ve posted this on psle maths. so pls do not repost anywhere else.


mods, thanks to move the above to psle maths