Q&A - PSLE Math

[peggy]

Kindly assist.



A number of passengers boarded an empty MRT train at pasir ris station.

At Tampines station, 2/5 of them alighted and 80 boarded the train.
At Simei station, 223 alighted and 38 boarded the train.
The train now has 3/8 of the number of passengers when it left Tampines station.

A. How many passengers were on the train when it left Simei station?
B. How many passengers were on the train when it left Pasir Ris station?

Thank you.

[zanen]

hello can help me with Peichun prelim 2012 qn 15 on circles? my laptop cannot upload photo. thanks

[MathIzzzFun]

zanen:

hello can help me with Peichun prelim 2012 qn 15 on circles? my laptop cannot upload photo. thanks

http://tinyurl.com/mathizzzfun-PeiChun-2012Prelim


cheers.

[zanen]

thanks MathIzzzFun can help me wif this too? Henry bought a box of pen and another box of pencils to sell them in the night market.The cost of a pen and a pencil was $12 and $8 respectively.In week 1,the same number of pen and pencil were sold and the total amount collectd by Henry was $1980.In week 2,67 pens and pencils were sold altogether.Henry collected $720 more from the sale of pens than pencils for the 2 weeks.How many pens were sold altogether in the 2 weeks?

[MathIzzzFun]

zanen:

thanks MathIzzzFun can help me wif this too? Henry bought a box of pen and another box of pencils to sell them in the night market.The cost of a pen and a pencil was $12 and $8 respectively.In week 1,the same number of pen and pencil were sold and the total amount collectd by Henry was $1980.In week 2,67 pens and pencils were sold altogether.Henry collected $720 more from the sale of pens than pencils for the 2 weeks.How many pens were sold altogether in the 2 weeks?

1 set of 1 pen + 1 pencil --> $20
Number of sets sold in week 1 --> $1980/$20 = 99

$12-$8 = $4 --> 1 pen cost $4 more than 1 pencil
99 x $4 = $396 --> Henry collected $396 more from sale of pens than pencils in week 1

$720-$396 = $324 --> Henry collected $324 more from sale of pens than pencils in week 2.
Number of pencils sold in week 2 --> (67x$12-$324)/($12+$8) = 24
Number of pens sold in week2 = 43
Total number of pens sold in 2 weeks = 43 + 99 = 142

cheers.

[jewelbox]

Appreciate any help on this qn (RGS SA1 2012) : http://i49.tinypic.com/i1invc.jpg\">

[tianzhu]

peggy:

Kindly assist.



A number of passengers boarded an empty MRT train at pasir ris station.

At Tampines station, 2/5 of them alighted and 80 boarded the train.
At Simei station, 223 alighted and 38 boarded the train.
The train now has 3/8 of the number of passengers when it left Tampines station.

A. How many passengers were on the train when it left Simei station?
B. How many passengers were on the train when it left Pasir Ris station?

Thank you.

Hi

Good Morning.

You may use MD or work with units.

It helps to have a simple diagram to show the flow of events.

The number of passengers leaving one station is the same as the number of passengers arriving at the next station.

Pasir Ris -------- 40 units

Tampines

At first -------- 40 units

2/5 of them alighted and 80 boarded the train.

Alighted ------- 16 units

Left ------- 24 units + 80

Simei

At first ------- 24 units + 80

223 alighted and 38 boarded the train.

Left -------- 24 units + 80 - 223 + 38 -------- 24 units – 105

The train now has 3/8 of the number of passengers when it left Tampines station.

24 units – 105 -------- 9 units + 30 (3/8 of 24 units + 80)

1 unit ------ 9

a)Number of passengers leaving Simei station ------- 9*9 + 30 -------- 111

b)Number of passengers leaving Pasir Ris station ------- 40*9 ------- 360.

Best wishes

[peggy]

Morning Tianzhu,


Much appreciated !!

Have a Great day.

Peggy

[tianzhu]

jewelbox:

Appreciate any help on this qn (RGS SA1 2012) : http://i49.tinypic.com/i1invc.jpg\">

Hi

Good Morning.

I don’t have time for slide now.

QRS is an isosceles triangle.

Similarly, QRU is also an isosceles triangle.

Angle UQR ------- 53 degrees.

Best wishes

[kay22]

Angelina and Smanatha took part in a cross country race. Angelina ran at a speed of 20 m/s. Both did not change their speed throughout the race. When Angelina covered 2/3 of the distance and Samantha covered 3/4 of the distance, they were 250m apart. what was Samantha's running speed?


:scratchhead: