Q&A - PSLE Math

[charsen]

ms_lim:

Can help to explain how to solve this question?


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C)
I try to find the general rule and i found it for how to find the total no.of tiles.It is (pattern no.x2-1)x(pattern no.x2-1)+4.
I subtracted 4 from the total no. of tiles in each question.For example,29-4=25.
You know that 25 is a square root of 5,which is a odd no.So,if you subtract 4 from all the total no. of tiles,you get the square root of odd no.Next,you should find the odd no. of the square root you found.
take pattern 3 as an example.
29-4=25
5x5=25
i need to find the relation ship between the pattern no. and the odd no.So,I used the formula to find odd numbers which is 2n-1-->(3+3)-1=5
And there,i found the formula.
Cheers

[charsen]

Winx5015:

Hi, anyone can help me with the following questions.


(1). A train left Station X with some commuters. At the first stop, no commuters alighted and the number of commuters who boarded the train was 1/5 of the original number of commuters in the train. At the second stop, 1/4 of the commuters alighted and 58 commuters boarded the train. At the third stop, 3/7 of the commuters boarded the train. At the last stop, all 315 commuters alighted. How many commuters were there when the train left Station x?

(2). Mother baked some square, round and oval cookies. For every 3 square cookies that were baked, 2 round cookies were baked. For every 4 square cookies that were baked, 3 oval cookies were baked.
(a). Find the ratio of the number of square cookies to round cookies to oval cookies baked.
(b). After mother baked another 120 round cookies, 30% of the cookies now were round cookies. How many square cookies did the bakery bake?

(3). Hadi had 295 more sweets than Ravi. After Hadi had given away 2/5 of the sweets he had and Ravi gave away 2/3 of the sweets he had, Hadi had 329 more sweets than Ravi. How many sweets did they have altogether at first?

Thank you

Hi
Q3.
At first: ravi-->15u Hadi--->15u+295


After :ravi--->5U Hadi---->9u+177
4U--->329-177=152
1U--->152/4=38
At first--->30u+295=(38x30)+295
=1495(ANS)

[charsen]

Winx5015:

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Can anyone tell me how to solve this question. Thanks

Hi
Is the shaded part quardrietlal QUTS?
cheers

[zanen]

hello can anyone help me wif this question? my fren sent it to me…Ken was climbing a flight of stair. While standing on a step, Ken realized that there were twice as many steps above he was step on,as there were below him. After ascending 8 more steps, he noticed that they were as many steps below him as they were above him. How many steps were there in the flight of stairs?

[zanen]

can help wif this too?Tim, Shah and Raj had 216 book marks altogether. At first, Time gave 24 book marks to Shah. Then Shah gave 9 book marks to Raj. After that, Raj gave 17 book marks to Tim. The total number of book marks that Shah and Raj have now is half of what Tim has. The number of book marks that Shah has now is 3/5 of the number of book marks that Raj has. How many book marks did Time and Raj have altogether.

[kuts]

Can anyone help me to solve the qn no. 29 of Tao Nan 2012 Prelims.


Thanks in advance

[kuts]

Help please… from Tao Nan Prelims 2012


1. There was some water in a container. Felicia first poured out 1/2 of the water. The she poured out 1/3 of the remaining water. In the third pouring, she poured ouot 1/4 of the remaining water and so on. How many times pouring will there be for the remaining water to be exactly, 1/10 of the original amount of water in the container?


Thanks in advance!

[tianzhu]

ms_lim:

Can help to explain how to solve this question?


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Hi

Where is this question from?

I don’t have the Casio calculator, so using 3.142 for pi.

Area for the left figure ------ area of two circles of radius 10cm

Area for the left figure ------ 2 * 3.142* 10*10 -------- 628.4

The right figure also has the same area.

Best wishes

[tianzhu]

Winx5015:

http://i49.tinypic.com/zuse15.jpg\">


Can anyone tell me how to solve this question. Thanks

Hi

PQR ------- 96

PSR ------- 48

STR ------- 24

QUR ------- 64

Shaded area ------QUTS ------ 64 – 24 ------ 40

Best wishes

[zanen]

mind helping wif this question? Tong Ming and Wei De bought 2 fruits, apples and oranges, from a fruit stall. Altogether, they bought 30 more apples than orange. Tong Ming bought 2/5 of the total number of fruits. Wei De bought 2/3 of the apples ajnd 1/2 of the orange. How many fruits did they buy altogether?