Q&A - PSLE Math

[tianzhu]

jtparent:

Hi, pse assist on the 2 quest:

1. Miss Wang got her pupils to form a circle. They stood at an equal distance apart from each other and were numbered in order. The pupil with number 5 stood directly across from the pupil with number 19. How many pupils were there in the circle?

Hi

Start with a simple visual representation.

Number of pupils between 5 and 19 ------- 14-1 ------13

Number of pupils in circle ------- 13+13+2 ------- 28

Best wishes

[Michaelia0816]

To Tianzhu, pls help with my math booklet HW last question,

OPQRS is part of a circle of radius 10cm. OPR and OQS are quarter circles. The area of the shaded part OQR is 40cm2, and the perimeter of the shaded part OQR is 28cm.

(Go to this web below for the picture of the figure)
http://t.co/4VZEguWj

For each following, use the calculator value of pi to find,
(a) the area of the figure OPQRS, correct to 2 decimal places,
(b) the perimeter of the figure OPQRS, correct to 2 decimal places

[tianzhu]

jtparent:

2. Tan, Lim and Wong had some pens to sell. Tan had the least number of pens. Wong's number of pens was 30% less then Lim. After Tan and Lim had each sold 50% of their pens, Lim had 95 more pens than Tan. If the 3 men had a total of 330 pens left, what was the total number of pens they had at first?

Hi

Lim ------- 10 units

Wong ------ 7 units

After Tan and Lim had each sold 50% of their pens,

Lim ------- 5 units

Tan ------- 5 units – 95

Wong ------- 7 units

17 units – 95 ------- 330

1 unit ------ 25

I’ll leave it to you to work out the rest of the details. The answer is 485.

Best wishes

[jtparent]

tianzhu:

jtparent:

2. Tan, Lim and Wong had some pens to sell. Tan had the least number of pens. Wong's number of pens was 30% less then Lim. After Tan and Lim had each sold 50% of their pens, Lim had 95 more pens than Tan. If the 3 men had a total of 330 pens left, what was the total number of pens they had at first?

Hi

Lim ------- 10 units

Wong ------ 7 units

After Tan and Lim had each sold 50% of their pens,

Lim ------- 5 units

Tan ------- 5 units – 95

Wong ------- 7 units

17 units – 95 ------- 330

1 unit ------ 25

I’ll leave it to you to work out the rest of the details. The answer is 485.

Best wishes

Thanks Tianzhu for the prompt 2 ans reply! Have a great wkend!
cheers

[tianzhu]

Michaelia0816:

To Tianzhu, pls help with my math booklet HW last question,

OPQRS is part of a circle of radius 10cm. OPR and OQS are quarter circles. The area of the shaded part OQR is 40cm2, and the perimeter of the shaded part OQR is 28cm.

(Go to this web below for the picture of the figure)
http://t.co/4VZEguWj

For each following, use the calculator value of pi to find,
(a) the area of the figure OPQRS, correct to 2 decimal places,
(b) the perimeter of the figure OPQRS, correct to 2 decimal places

Hi

I believe you merely just wanted to confirm your answers.

They are 117.10 sq cm and 43.42cm.

Bye and have a nice weekend.

Best wishes

[Michaelia0816]

Ok

[Michaelia0816]

Thanks!

[Michaelia0816]

tianzhu:

Michaelia0816:

To Tianzhu, pls help with my math booklet HW last question,

OPQRS is part of a circle of radius 10cm. OPR and OQS are quarter circles. The area of the shaded part OQR is 40cm2, and the perimeter of the shaded part OQR is 28cm.

(Go to this web below for the picture of the figure)
http://t.co/4VZEguWj

For each following, use the calculator value of pi to find,
(a) the area of the figure OPQRS, correct to 2 decimal places,
(b) the perimeter of the figure OPQRS, correct to 2 decimal places

Hi

I believe you merely just wanted to confirm your answers.

They are 117.10 sq cm and 43.42cm.

Bye and have a nice weekend.

Best wishes

But can you still give me the solution, my answer not similar to your

[tianzhu]

Michaelia0816:

But can you still give me the solution, my answer not similar to your

Hi

Don’t worry too much about not having the same answers as me. My answers may not be correct.

To better illustrate the solution, it’s preferable to have some form of visual representation.

I’ll PM to you, hopefully, by tomorrow evening.

Best wishes

[jtparent]

tianzhu:

jtparent:

2. Tan, Lim and Wong had some pens to sell. Tan had the least number of pens. Wong's number of pens was 30% less then Lim. After Tan and Lim had each sold 50% of their pens, Lim had 95 more pens than Tan. If the 3 men had a total of 330 pens left, what was the total number of pens they had at first?

Hi

Lim ------- 10 units

Wong ------ 7 units

After Tan and Lim had each sold 50% of their pens,

Lim ------- 5 units

Tan ------- 5 units – 95

Wong ------- 7 units

17 units – 95 ------- 330

1 unit ------ 25

I’ll leave it to you to work out the rest of the details. The answer is 485.

Best wishes

Hi

may i know how u get the ans 485 cos my is 580

lim 10 u - 250
wong 7 u - 175
tan 250-95 =155