Q&A - PSLE Math

[tianzhu]

zombie:

Can someone please help me with the question ?

Hi

Make the total number of units the same.

T: (D+H+F) -------- 1:4 (5) --------- 6:24 (30)

(T+H+F) -------- 7:23 (30) ------ 7:23 (30)

H: (T+D+F) --------- 4:11(15) ------- 8:22 (30)

T ------ 6 units

D ------ 7 units

H ------ 8 units

F ------- 9 units

9 units ------- 36

1 unit ------ 4

Tom donated $24 (6*4)

Best wishes

[student101]

Great way of solving this problem, thanks ace tutor.cheers

[student101]

Mathizfun… hats off you…thanks a lot to solve it easily. Easy to understand and quite nice way of solve it. lot of thanks.

[ximinful]

Pls help with the following question.

Min had 3 times as many beads as Ahmad. Min packed all her beads equally into 42 boxes while Ahmad packed all his beads into 56 bags. There are 93 more beads in each box than in each bag. How many beads did min and Ahmad have in total?

Tia :thankyou:

[zombie]

Thanks a lot, Tianzhu, wonderful to have you around, better than my tutor !

[charsen]

tianzhu:

zanen:

hello can help me with this qns 10 workers can complete a painting job. If there are 2 more workers, the painting job will be completed 6 days sooner. If the same painting job were to be done 21 days earlier, how many additional workers are needed?

Hi

A point to note, the more the number of workers, the fewer the number of days.

Increase in 2 workers ------- 6 days earlier

Increase in 1 workers ------- 3 days earlier

Increase in 7 workers ------- 21 days earlier

Additional workers ------- 7

Best wishes

Hi Tianzhu,
This is my worked solution.
12 workers----->6 days earlier.
Total amount of mandays reduced--->10x6=60 mandays.
compensted work---->2 additional workers
Days covered to complete compensated work---->60/2=30
and originally, the 10 workers work for 30 + 6 = 36 days,

Total work needed for the painting job = 12 x 30 = 360 man- days.

To work 21 days less means working for 36-21 = 15 days

Number of workers needed = 360 man-days / 15 days = 24 workers

So, additional worker needed = 24 - 10 = 14

cheers

[Zhu99]

ximinful:

Pls help with the following question.

Min had 3 times as many beads as Ahmad. Min packed all her beads equally into 42 boxes while Ahmad packed all his beads into 56 bags. There are 93 more beads in each box than in each bag. How many beads did min and Ahmad have in total?

Tia :thankyou:

A - 1 u ---> 56 Bags

1 Box ---> 1 Bag + 93

M - 3 u ---> 42 Boxes = 42 x (1 Bag + 93)
= 42 Bags + 3906

42 Bags + 3906 ---> 3 x 56 Bags
126 Bags ---> 3906

56 Bags ---> 3906/126 x 56 = 1736

4 u ---> 1736 x 4 = 6944

Min and Ahmad had 6944 beads in total.

[tianzhu]

charsen:

Hi Tianzhu,

This is my worked solution.

Hi charsen

Yes, you are correct.

Thank you for highlighting the error.

Best wishes

[2632parent]

Need help on the following question


1) Mr Tan had some apples and oranges in the ratio 4:5. After selling 170 apples and 25% of the oranges, the ratio of the apples to oranges left became 1:2. What was the number of fruits Mr Tan had in the end?

Thank you

[tianzhu]

2632parent:

Need help on the following question


1) Mr Tan had some apples and oranges in the ratio 4:5. After selling 170 apples and 25% of the oranges, the ratio of the apples to oranges left became 1:2. What was the number of fruits Mr Tan had in the end?

Thank you

Hi

At first

Apples ----- 16 units

Oranges ------ 20 units

Change

Apples ----- 170

Oranges ------ 5 units (25%)

In the end

Apples ----- 1 part

Oranges ------ 2 parts

16 units – 170 ------ 1 part

(x2)
32 units - 340 ------- 2 parts

15 units ------- 2 parts

Equalising the parts

32 units – 340 ------- 15 units

1 unit ------ 20

Number of fruits in the end ------- (16*20 – 170) + (15*20) ------- 450

Best wishes