Q&A - P5 Math

[MathIzzzFun]

blueymum:

Thanks


Just to check how did you derive 35u:45u ?

Appreciate your help.

Hi
u r welcome

Sam + Andy --> 7 + 9 = 16
Ken's salary : Sam + Andy --> 1: 5
So, need to make Sam + Andy a multiple of 5 and the lowest common multiple of 16 & 5 is 80 ie 16 x 5

cheers.

[blueymum]

Thanks so much.


Was trying this:
Pam’s savings was 3/7 of Mary’s savings.
Jan’s savings was 2/5 of the total savings of the three children.
Pam and Mary have $240 more than jan.
How much is pam’s savings?

P:S —> 3:7
J: P+ S—> 2:4

Is this right? And how do I do the next step?

Thanks !!

[small]

Hi blueymum,


HTH…

Pam's savings was 3/7 of Mary's savings. Jan's savings was 2/5 of the total savings of the three children. Pam and Mary have $240 more than Jan. How much is pam's savings?

Pam's savings was 3/7 of Mary's savings
Pam : Mary
3 : 7
9U : 21U (total 30 Units)

Jan's savings was 2/5 of the total savings of the three children.
Jan : Pam + Mary
2 : 3
20U : 30U

Jan : Pam : Mary
20 : 9 : 21

Given Pam and Mary have $240 more than Jan.
30U – 20U = 240
10U = 240
1U = 24

Pam have 9 units
9 x 24 = 216

[happyheart]

Need help with these 3 questions. Thanks in advance.


Q1. The cost of a pair of soccer boots and a tshirt is $175. The cost of the tshirt and a cap is $64. The cost of the pair of soccer boots is 4 times the cost of the cap. How much more does the pair of soccer boots cost than the tshirt?
Ans: $121

[happyheart]

Q2.

A pet farm had the same number of kittens, puppies and rabbits at first. After 35 kittens, some puppies and rabbits were sold, there were 65 animals left. There were thrice as many rabbits as puppies left. There were 26 fewer kittens left than the rabbits left. How many rabbits and puppies were sold?
Ans: 44

Pls help, thanks!

[happyheart]

Q3:

Kassim had 3 times as many stamps as Peiling. Leonard had 82 stamps more than Peiling. Kassim then sold 106 of his stamps and Leonard bought another 50 stamps. Kassim and Leonard had an equal number of stamps in the end.

a) How many more stamps did Kassim have than Peiling in the end?
Ans:132

b) How many stamps did the three of them have altogether in the end?
Ans: 621

In MD, I always have problem determining where to place the give away number and the additional bought. Appreciate your help pls.

[small]

happyheart:

Need help with these 3 questions. Thanks in advance.


Q1. The cost of a pair of soccer boots and a tshirt is $175. The cost of the tshirt and a cap is $64. The cost of the pair of soccer boots is 4 times the cost of the cap. How much more does the pair of soccer boots cost than the tshirt?
Ans: $121

Hi happyheart,

HTH for Q1

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[tianzhu]

happyheart:

Q2.

A pet farm had the same number of kittens, puppies and rabbits at first. After 35 kittens, some puppies and rabbits were sold, there were 65 animals left. There were thrice as many rabbits as puppies left. There were 26 fewer kittens left than the rabbits left. How many rabbits and puppies were sold?
Ans: 44

Pls help, thanks!

Hi

You may use MD.

In the end, the number of animals left is:

Rabbits ----- 3 units
Puppies ----- 1 unit
Kittens ------ 3 units – 26

7 units ------ 65+26 ------91
1 unit ------ 13

Number of rabbits left ------ 3*13 ------ 39
Number of puppies left ------- 13

Number of kittens at first ------ 13+35 ------- 48

Number of rabbits sold ------ 48 – 39 ------ 9
Number of puppies sold ------- 48 – 13 ------ 35

The answer is (35+9) or 44

Best wishes

[tianzhu]

happyheart:

Q3:

Kassim had 3 times as many stamps as Peiling. Leonard had 82 stamps more than Peiling. Kassim then sold 106 of his stamps and Leonard bought another 50 stamps. Kassim and Leonard had an equal number of stamps in the end.

a) How many more stamps did Kassim have than Peiling in the end?
Ans:132

b) How many stamps did the three of them have altogether in the end?
Ans: 621

In MD, I always have problem determining where to place the give away number and the additional bought. Appreciate your help pls.

Hi

Due to time constraints. I’ll give some pointers instead of drawing MD.

1)Draw 3 boxes to show Kassim’s stamps.

2)Draw 1 box to show Pei Ling’s stamps

3)Draw I box + 82 to show Leonard’s stamps.

4)Move 106 from end of the third box and draw a vertical line to cut all 3 MD.

5)Add 50 to Leonard(1 box+82) to touch vertical line drawn in (4)

6) Now we can see 2 units ------ 82+50+106 ----- 238
1 unit ------ 119

In the end

Kassim ------- (3*119) – 106 ------ 251 stamps left
Pei Ling ------- 119

251 – 119 ------ 132

In the end

Kassim ------- 251
Leonard ------ 251
PL ------- 119

Total number of stamps -------- 621

Best wishes

[small]

happyheart:

Q2.

A pet farm had the same number of kittens, puppies and rabbits at first. After 35 kittens, some puppies and rabbits were sold, there were 65 animals left. There were thrice as many rabbits as puppies left. There were 26 fewer kittens left than the rabbits left. How many rabbits and puppies were sold?
Ans: 44

Pls help, thanks!

Hi happyheart,

HTH, solution for Q2

In the end
Rabbits : Puppies : Kittens
3U : 1U : 3U - 26

Given that in the end, there were 65 animals left:

7U – 26 = 65
7U = 91
1U = 13

Number of Rabbit and puppies left in the end ------ 4 Units = 52


At first
Kittens ----- (3U – 26)+35
= 39 – 26 + 35
= 48

Number of Rabbits and Puppies at first ----- 48 + 48 =96

96 – 52 = 44

44 rabbits and puppies were sold.