Q&A - PSLE Math

[2632parent]

Councillor Thanks for the solution but I have problem understanding how you get

2u + 2(676) ----- 1504

[tianzhu]

2632parent:

Councillor Thanks for the solution but I have problem understanding how you get

2u + 2(676) ----- 1504

Hi

14 units + 2 parts ------- 1504

2 units + (12 units + 2 parts) ------- 1504

2 units + (6 units + 1 part) + (6 units + 1 part) ------- 1504

6 units + 1 part ----- 676

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

Best wishes

[2632parent]

A very big thank you to both tianzhu and councillor , now I really … Understanding. Thank you for your explaination and patience. Luv you both…

[jonaandr]

Help needed for these 2 questions - many thanks in advance!


1) 2 , 5 , 17 , 71 , X , 2159
Study the above number pattern. Find the value of X.

Ans: 359, pls tell me why.

2) When Karen left her house and drove at an average speed of 56km/h, she would reach Town X at 1900. If she decided to drive at an average speed of 72km/h, she would reach Town X at 1700. At what time did she leave her house?

[2632parent]

Any one more question


1) Mr lim had some red and green beads. 60% of his beads were red and the rest were green. He lost some of his red beads and the percentage of the beads which were red decreased by 40%. He then had 760 red and green beads left. How meant red beads did he lose?

Many thanks in advance.

[shawnlim88]

jonaandr:

Help needed for these 2 questions - many thanks in advance!


1) 2 , 5 , 17 , 71 , X , 2159
Study the above number pattern. Find the value of X.

Ans: 359, pls tell me why.

2) When Karen left her house and drove at an average speed of 56km/h, she would reach Town X at 1900. If she decided to drive at an average speed of 72km/h, she would reach Town X at 1700. At what time did she leave her house?

hi
Qn1: No idea.
Qn2:
S = Dist/TIme
Let Starting TIme Be S. Distance be D

56 = (D) / (19-S)
72 = (D) / (17-S)

cross multiply
72(17-S) = 56(19-S)
1224 -72S = 1064 - 56S
16S = 160
S = 10

starting Time at 10:00 hrs

not sure if this is correct

[MathIzzzFun]

jonaandr:

Help needed for these 2 questions - many thanks in advance!


1) 2 , 5 , 17 , 71 , X , 2159
Study the above number pattern. Find the value of X.

Ans: 359, pls tell me why.

Hi

where is this question from?

2nd number = 1st number x 2 + 1
3rd number = 2nd number x 3 + 2
4th number = 3rd number x 4 + 3
5th number = 4th number x 5 + 4 = 71 x 5 + 4 = 359

cheers.

[tianzhu]

2632parent:

Any one more question


1) Mr lim had some red and green beads. 60% of his beads were red and the rest were green. He lost some of his red beads and the percentage of the beads which were red decreased by 40%. He then had 760 red and green beads left. How meant red beads did he lose?

Many thanks in advance.

Hi

Good Morning.

Red ----- 60 units ------ 600

Green ----- 40 units

After a decrease of 40%

Red ----- 36 units ------ 360

36 + 40 ------ 76

76 units ------- 760

1 unit ------10

In the end, red ------ 360

Therefore, he lost 600 - 360 ---- 240

Best wishes

[Shimmer]

Need help !


The table below shows the admission fees to a circus for an adult and a child. There were 50 more children than adults at the circus. If a total of $5614 was collected, how many children were at the circus ? Given each adult admission fee is $25 Ang child admission fee is $8.

[tianzhu]

Shimmer:

Need help !


The table below shows the admission fees to a circus for an adult and a child. There were 50 more children than adults at the circus. If a total of $5614 was collected, how many children were at the circus ? Given each adult admission fee is $25 Ang child admission fee is $8.

Hi

You may use “Grouping Concept”.

Fees collected from 50 children ------- 400

5614 – 400 ------ 5214

Fees for 1 group or 1 set of (1 adult + 1 children) -------- 25 + 8 ------ 33

Number of groups ------- 5214/33 ------ 158

Number of children ------- 158 + 50 ----- 208

Best wishes