Q&A - P3 Math

[tianzhu]

Champion:

Hi Tianzhu,
Thanks so much for your detailed explanation; appreciates :thankyou:

Hi Champion

You're welcome.

Best wishes

[deep]

Before a game, Benson had 3/5 as many marbles as Sharul. During the game, Sharul lost 63 marbles to Benson, after which Benson had twice as many marbles as Sharul. How many marbles did Benson have at first?

[tianzhu]

deep:

Before a game, Benson had 3/5 as many marbles as Sharul. During the game, Sharul lost 63 marbles to Benson, after which Benson had twice as many marbles as Sharul. How many marbles did Benson have at first?

Hi

You may use the Units Method.

At first
Benson ----- 3 units ------- 9 units
Sharul ------ 5 units ------- 15 units
Total ------- 8 units -------- 24 units

In the end.
Benson ----- 2 units -------- 16 units
Sharul ----- 1 unit ------- 8 units
Total ----- 3 units ------- 24 units

The total number of marbles before and after the transfer remains the same. Make the total number of units before and after the same.A common multiple of 3 and 8 is 24.

Difference in units ------ 7 units
7 units ------63
1 unit ------- 9

Benson ------ 9 units ------- 81 marbles

Best wishes

[deep]

Why is it become 9 and 15? cant understand that…

[tianzhu]

deep:

Why is it become 9 and 15? cant understand that..

Hi

The total number of marbles before and after the transfer remains the same. Make the total number of units before and after the same.A common multiple of 3 and 8 is 24.

At first
Benson ----- 3 units ------- 9 units (3*3)
Sharul ------ 5 units ------- 15 units (5*3)
Total ------- 8 units -------- 24 units (8*3)

Do the same for \"In the end\" units.This time multiply each row by 8

In the end.
Benson ----- 2 units -------- 16 units
Sharul ----- 1 unit ------- 8 units
Total ----- 3 units ------- 24 units

Best wishes

[shurley197323]

Pls help. MRS CHENG USED 4/5KG OF 2KG OF SUGAR TO MIX WITH SOME FLOUR. THE AMOUNT OF FLOUR SHE USED IS 1/10KG LESS THAN THE AMOUNT OF SUGAR. WHAT WAS THE MASS OF THE MIXTURE.?

[blessedami]

shurley197323:

Pls help. MRS CHENG USED 4/5KG OF 2KG OF SUGAR TO MIX WITH SOME FLOUR. THE AMOUNT OF FLOUR SHE USED IS 1/10KG LESS THAN THE AMOUNT OF SUGAR. WHAT WAS THE MASS OF THE MIXTURE.?

Hi

Do you mean 4/5 of 2kg of sugar?? :?

If so, then 4/5 of 2kg would be 4/5 of 2000g which is 1600g

Then, since he used 100g (1/10 kg is 100g) less flour, he used 1500g of flour.

So, the total would be 1600g + 1500g = 3100g = 3kg 100g

Not really sure though....

[shurley197323]

Yes.Thanks blessedami. The answer is the same. 3kg100g

[SPI]

I need help on this. Thanks in advance.


3 shirts cost as much as 5 blouse. Mrs Tan bought 2 such shirts and 4 blouses for $110. find the cost of 6 such shirts

[tianzhu]

SPI:

3 shirts cost as much as 5 blouse. Mrs Tan bought 2 such shirts and 4 blouses for $110. find the cost of 6 such shirts

Hi

A common multiple of 3 and 5 is 15.

Shirt ----- 5 units
Blouse ------ 3 units

(2*5) + (4*3) ------ 22 units
22 units ----- 110
1 unit ----- 5

1 shirt ------ $25
6 shirts ----- $150

Best wishes