Q&A - PSLE Math

[MathIzzzFun]

Hifive:

Hi MathIzzzFun


Many thanks for your explanation to my question.

Cheers

Hi Hifive,

u r welcome

Regarding your question : “why 12 / 0.8?” - Every minute, the water level tank A will be 0.8cm higher than that in tank B. Since tank B had a headstart of 12 cm, in order for water level in tank A to be the same as in tank B, it must make up for this headstart of 12cm, so 12cm/0.8cm/min = 15 min.

cheers.

[Hifive]

Hi MathIzzzFun


Yes, now I can understand! Thanks so much!

[bobsg01]

P6 Problem


Thanks in advance for any help.

http://i55.tinypic.com/2zjdgt0.jpg\">

[MathIzzzFun]

Hifive:

Hi MathIzzzFun


Yes, now I can understand! Thanks so much!

Hi Hifive,

u r welcome

cheers.

[MathIzzzFun]

bobsg01:

P6 Problem


Thanks in advance for any help.

http://i55.tinypic.com/2zjdgt0.jpg\">

Hi

Initially, Mr Tan had 5u.
He sold 40% = 2u, and was left with 60% = 3u = 270, 1u = 90

a) Mr Tan sold 2u = 2 x 180 = 180 items

Number of items bought by Peter = 40% x 180 = 72

b) Number of items Peter had at first = 270 - 72 = 198

cheers.

[bobsg01]

Thank you MathIzzzFun for the solution.


Cheers. :rahrah: :rahrah: :rahrah:

[Andrew Lee]

Shop A and shop B are selling ePad. If shop A sells the ePad at a discount of 10%, its discounted selling price will be $300 more than the usual selling price in Shop B. If Shop A sells the ePad at a discounts of 50%, its discounted selling price will be $100 less than the usual selling price in Shop B. Find the usual selling price of the ePad in Shop B ?

[MathIzzzFun]

bobsg01:

Thank you MathIzzzFun for the solution.


Cheers. :rahrah: :rahrah: :rahrah:

avec plaisir

cheers.

[Andrew Lee]

A coin box contained some $0.20 cent & $0.50 cent coins in the ratio of 4 : 5. When 16 $0.50 cent coins were taken out and replaced by some $0.20 cent coins, the ratio then became 8 : 7. The total value of the $0.20 cent coins added was the same as the total value of the $0.50 cent coins taken out. Find the sum of money in the coins box .

[linden2000]

40% is $300 + $100 =$400

100% is $1000
SP at shop A b4 disct is $1000
SP at shop B is (0.9 x 1000) -300 =$600