Q&A - PSLE Math

[match3frog]

tianzhu:

match3frog:

2) Question 16 - ???? missing from this question below


In an amusement park, there were 3/8 as many girls as boys. After 20 boys left that park and 12 girls entered the park, the ratio of boys to girls became 3:7
(a) How many girls were at the amusement park at first? (ans: 144)
(b) How many children were at the amusement park at the end? (ans: 520)

Thanks!

Hi

Good Morning.

If you work backwards from the given answer, the missing ratio is 3:7.

Best wishes

Hi Tianzhu,

Thank you! Have a good day.

Rgds

[Michaelia0816]

Hi again! I was unsure of a question and would like to get step by step answer. This question that makes me unsure cause of remainder!!! It was like a p5 question but appear in p6 question!

----------------------------------------------------------------------------------In a camp, there was 1 teacher for every 20 pupils. The number of girls was 3/5 the number of boys. There were 420 more boys than girls.
a) How many children were in the camp?
b) How many teachers were in the camp?
Dear friends here, I know the a) answer is 1050, but when you divide by 20, the answer is 52 R 10, should the answer round up to 53?

[Michaelia0816]

Give me a yes and no answer as I do not have time to read step by step answer.

[tianzhu]

Michaelia0816:

Hi again! I was unsure of a question and would like to get step by step answer. This question that makes me unsure cause of remainder!!! It was like a p5 question but appear in p6 question!

----------------------------------------------------------------------------------In a camp, there was 1 teacher for every 20 pupils. The number of girls was 3/5 the number of boys. There were 420 more boys than girls.
a) How many children were in the camp?
b) How many teachers were in the camp?
Dear friends here, I know the a) answer is 1050, but when you divide by 20, the answer is 52 R 10, should the answer round up to 53?

Hi

The answers are (a) 1680 and (b) 84.

2 units ----- 420
1unit ----- 210

8 units ----- 1680

1680/20 ----- 84

Best wishes

[Michaelia0816]

If no, just me the answer will do!!!

[small]

Michaelia0816:

Hi again! I was unsure of a question and would like to get step by step answer. This question that makes me unsure cause of remainder!!! It was like a p5 question but appear in p6 question!

----------------------------------------------------------------------------------In a camp, there was 1 teacher for every 20 pupils. The number of girls was 3/5 the number of boys. There were 420 more boys than girls.
a) How many children were in the camp?
b) How many teachers were in the camp?
Dear friends here, I know the a) answer is 1050, but when you divide by 20, the answer is 52 R 10, should the answer round up to 53?

Hi,
HTH.......

a)
2 units ----- 420
1 unit ----- 210

8 units ----- 8 x 210 = 1660

b)
Total pupils ----- 1660

1660 / 20 = 83 teachers

[small]

Duh, typo as phone screen is too small.


The correct answer is 1680 pupils and 84 teachers,

[thinkgmama]

Please help on this question :


1) 65% of the members in the IT club were male. When 212 more members joined the club, the number of male members increased by 60% while the number of female members increased by 20%. How many members are there in the end?

2) There were some red and blue pens in a box. 30% of the pen were red. When 82 pens were added, the number of red pens increased by 20% while the number of blue pens increased by 50%. How many blue pens were there in the box in the end?

[tianzhu]

thinkgmama:

Please help on this question :


1) 65% of the members in the IT club were male. When 212 more members joined the club, the number of male members increased by 60% while the number of female members increased by 20%. How many members are there in the end?

2) There were some red and blue pens in a box. 30% of the pen were red. When 82 pens were added, the number of red pens increased by 20% while the number of blue pens increased by 50%. How many blue pens were there in the box in the end?

Hi

For Q1, please check the numbers in your question.

Q2)

First ------ Red pen: Blue pen ------ 30:70

30*0.2 ------- 6
70*0.5 ------- 35

After ------ Red pen : Blue pen ------ 36 :105

41 units ------ 82
1 unit ------ 2

105 units -------210

Best wishes

[thinkgmama]

Hi Tianzhu,


Thanks! The ans should be 210 blue pens right?