Q&A - PSLE Math

[MathIzzzFun]

superksmum:

Hi, help needed again.


Mr Brown made two real estates sales. The first property was transacted at $800,000, and he gained 10% from it. The second property was transacted at $1,000,000, and the gain was 20%. What was his average gain in percentage for the two properties?

Thanks you

Hi

Original price of 1st property = $800 000/1.1
Original price of 2nd property = $ 1000 000/ 1.2
Total original price = $51500000/33
Total transacted price = $ 1800000
$1800000/($51500000/33) x 100% = 115.34% (to 2 decimal places)
So, average percentage gain = 15.34%

cheers.

[cycjca]

Hi

need help super-desperately:

A min ago, 40% of the people in the theatre were adults, 210 more people entered the theatre. As a result, the number of adults increased by 100% and the number of children increased by 50%. How many people are there in the theatre now?

Thanks in advance.

[small]

cycjca:

Hi

need help super-desperately:

A min ago, 40% of the people in the theatre were adults, 210 more people entered the theatre. As a result, the number of adults increased by 100% and the number of children increased by 50%. How many people are there in the theatre now?

Thanks in advance.

Hi,

HTH...

Before
The ratio of adult to children ----- 4 : 6 (total 10 units)

After
adults increased by 100% and the number of children increased by 50%.
thus the ratio of adult to children nou ----- 8 : 9 (total 17 units)


Thus means after 210 more people entered the theatre, there are increasing of 7 units

7 units ----- 210
1 unit ----- 30

People in the theatre now ------ 17 units

17 units --- 17 x 30 = 510 people.

[cycjca]

Thank you so much! Now we can try to solve the remaining paper…Thanks again!

[small]

You are welcome cycjca.


As tomorrow is a holiday, don't push too hard, rest more and continue the rest tomorrow morning.

[cycjca]

Haha, i know but its hard to go to bed when there are so many unresolved questions in my head


Thanks again!! Happy May day

[anneshirleygilbert]

Can somebody please help with this question?


From Level 1 to Level 2, there were 2 flights of stairs of equal number of steps. For the first flight of stairs, Jerry walked up some steps and ran 13 steps, and took a total of 38 seconds.
Then, he got tired and for the second flight of stairs, he walked up some steps and ran 5 steps, taking 70 seconds this time. (Assume that the speed of walking and running for both flights of stairs remains constant.).
Hoe many minutes will Jerry take if he only walks up from Level 1 to Level 2? (Answer given is 3 minutes).

TIA

[tianzhu]

anneshirleygilbert:

Can somebody please help with this question?


From Level 1 to Level 2, there were 2 flights of stairs of equal number of steps. For the first flight of stairs, Jerry walked up some steps and ran 13 steps, and took a total of 38 seconds.
Then, he got tired and for the second flight of stairs, he walked up some steps and ran 5 steps, taking 70 seconds this time. (Assume that the speed of walking and running for both flights of stairs remains constant.).
Hoe many minutes will Jerry take if he only walks up from Level 1 to Level 2? (Answer given is 3 minutes).

TIA

Hi

Good Morning.

You may express in MD or use letters of alphabet.

For first flight
W + R13 --------38

For the second flight
W + R5 -------- 70

Difference in time between running and walking 8 steps --------- 32 (70-38)

Hence the difference between running and walking 1 step -------- 32/8 --------4

Now go back to the second flight, if you now walking instead of running 5 steps,you’ll add (5*4) --------20 s

W +W5 -------- 70 + 20 -------- 90

90*2 ------ 180

For both flights (walk), the time taken is 180 seconds or 3 minutes

Best wishes

[anneshirleygilbert]

Thank you very much, tianzhu. Wasn’t expecting anyone so early. Have a good day!

[small]

anneshirleygilbert:

Can somebody please help with this question?


From Level 1 to Level 2, there were 2 flights of stairs of equal number of steps. For the first flight of stairs, Jerry walked up some steps and ran 13 steps, and took a total of 38 seconds.
Then, he got tired and for the second flight of stairs, he walked up some steps and ran 5 steps, taking 70 seconds this time. (Assume that the speed of walking and running for both flights of stairs remains constant.).
Hoe many minutes will Jerry take if he only walks up from Level 1 to Level 2? (Answer given is 3 minutes).

TIA

I think Tianzhu posted this question before for us to try.