Q&A - PSLE Math

[tianzhu]

jeysri72:

Q17:there were 1000 students at the parade ground and indoor sports hall. 40% of the 600 students at the parade ground were girls. 60% of the students at the indoor sports hall were girls. After some of the students in both venues moved from one venue to the other, 30% of the students in the parade ground and 70% of the students at the indoor sports hall were girls. How many students were there in the indoor sports hall after the movement had taken place? Ans: 450

Hi

Good Morning.

This question was first discussed on page 434.
http://www.kiasuparents.com/kiasu/forum/viewtopic.php?f=69&t=280&start=4330

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[tianzhu]

jeysri72:

Q18: A large warehouse had a total of 2180 black, red and white t-shirts for sale. the ratio of black t shirt to red t shirts was 3:1. after 2/5 of the black t shirts and 1/3 of the white t shirts and none of the red t shirts were sold, there were 1504 t shirts left. how many red t shirts were there at first? ans: 380

Hi

You may use MD or UM.

At first
Black ---- 15 units (3)
Red -----5 units (1)
White ---- 3 parts

Sold

Black ------ 6 units
Red ----- none
White -----1 part

Left
Black ------ 9 units
Red ----- 5 units
White -----2 parts

9 units + 5 units + 2 parts ----- 1504

14 units + 2 parts ------1504 ----------( E1)

20 units + 3 parts ------2180 -------- (E2)

(E2) –(E1) gives 6 units + 1 part ------676

From (E1)

2 units + 2(676) --------1504

1 unit -----76

At first, red t shirt --- 5 units -----5*76 -------380

Best wishes

[ck123]

Hi

Can someone confirm the answer for nan hua 2011 prelim maths paper 2 question 14? Answer given 34 seats my answer 39 seats if I am wrong please help to show the workings thanks.

[P.047330KH]

Dear tianzhu , thanks a lot for your quick reply … It was really helpful . 

[Vanilla Cake]

ck123:

Hi

Can someone confirm the answer for nan hua 2011 prelim maths paper 2 question 14? Answer given 34 seats my answer 39 seats if I am wrong please help to show the workings thanks.

For the benefit of interested readers who have no access to Nan Hua 2011 P6 Prelim Maths exam paper, here's the paper 2 Q14 while waiting reply from KSP members to confirm the correct answer:

A train has a capacity of 154 seats. Tickets for seats are sold at $8 and $12. There are 1/5 more $8-seats than $12-seats on the train. During a trip, the amount collected from the sales of $8 tickets was twice the amount collected from the $12 tickets. The total amount collected was $540. How many $8-seats were not taken during the trip?

VC's mum

[andante]

ck123:

Hi

Can someone confirm the answer for nan hua 2011 prelim maths paper 2 question 14? Answer given 34 seats my answer 39 seats if I am wrong please help to show the workings thanks.

Hi,
The answer given for my nan hua paper is 39 and my DD also worked out as 39.

[ck123]

Hi andante


Thanks for confirming.
:thankyou:

[ozora]

Mr Lee bought some shirts for $425. if He was given a discount of 15%, he would be able to buy 5 more shirts for the same amount of money. What is the original price of shirt?

is it equate 85%=>425
100% -> 500?
then how?

[raghupavithra]

it takes Mr Adams 20 minutes to saw a pole into 5 equal pieces how many minutes would it take him to saw another similar pole into 10 equal pieces?



how to solve this/

[zsqchx]

Could someone help me to solve Q.27 for Henry Park prelim 2011 paper1? Thank you.