Q&A - PSLE Math

[babyluvv]

Need help


1) Box A contained 134 marbles and Box B contained 18 marbles at first. An equal number of marbles was added to each box. As a result of this, the number of marbles in A to the number of marbles in B became 5 : 1.
a) How many marbles were added to each box?
b) Next, some marbles were transferred from Box A to Box B so that there was an equal number of marbles in each box. How many marbles were there in each box in the end?

2) 7/12 of the guests in a party are adults. The ratio of the number of boys to the number of girls is 6 : 9. respectively. There are 144 more adults than girls. What is the total number of guests at the party?

[tianzhu]

babyluvv:

1) Box A contained 134 marbles and Box B contained 18 marbles at first. An equal number of marbles was added to each box. As a result of this, the number of marbles in A to the number of marbles in B became 5 : 1.
a) How many marbles were added to each box?
b) Next, some marbles were transferred from Box A to Box B so that there was an equal number of marbles in each box. How many marbles were there in each box in the end?

2) 7/12 of the guests in a party are adults. The ratio of the number of boys to the number of girls is 6 : 9. respectively. There are 144 more adults than girls. What is the total number of guests at the party?

Hi

For the benefits of other members, it may be useful to indicate if the questions are for P5 or P6.

A quick one

For Q1, a student should note that the difference in the number of marbles between Box A and box B remains the same before and after as equal number of marbles are added to each box.

You may solve it with MD.

4 units ----- 134 – 18 ----- 116
1 unit ----- 29

a) 29 – 18 ------ 11

b) 3 units ------ 3*29 -----87

For Q2, you may do it with MD.

Draw a box and divide into 12 units.

7 units ------ adults
5 units ------children(boys and girls)

Boys: Girls ------ 6:9 --------2:3
Therefore, 2 units ------ boys and 3 units ------- girls

7 - 3 ------ 4

4 units -------- 144
1 unit ------- 36

12 units ------432

Hope this helps.

Best wishes

[babyluvv]

Thanks for the prompt response, Tianzhu.

Okies… its a P6 Maths question.

[tianzhu]

babyluvv:

Thanks for the prompt response, Tianzhu.

Okies.. its a P6 Maths question.

Hi babyluvv

You're welcome.

Have a nice weekend.

Best wishes

[shurley197323]

Please help

1) Susie bought 5 kg of flour and 4 kg of sugar for $14.80. If 3/4 kg of flour coast as much as 3/5kg of sugar, find the cost of 1 kg of sugar ?

2)The no of marbles Aaron has is 8 more than 4 times that of Bala’s. The no of marbles that Najib has is 5 more than 1/8 of Aaron’s. Najib has 9 fewer marbles than Bala. How many marbles do they have altogether.

[shurley197323]

Please help again - SOS


1) Wendy and pei fen had $128 altogether. WEndy spent 1/2 of her money on a blouse while Peifen spent 2/5 of her money on a dress. The dress cost $8 more than the blouse. How much did Wendy have at first ?

[tianzhu]

shurley197323:

Please help again - SOS


1) Wendy and pei fen had $128 altogether. WEndy spent 1/2 of her money on a blouse while Peifen spent 2/5 of her money on a dress. The dress cost $8 more than the blouse. How much did Wendy have at first ?

Hi

SOS, presumably more urgent
A quick one.

You may use MD.

Wendy ------ 2 parts
Pei Fen ------ 5 units

2 units ------ 1 part + 8 (The dress cost $8 more than the blouse.)

9 units ------ 128 +16 ------ 144
1 unit -------16

1 part ------ 32 – 8 ------24
2 parts ------- 48

Wendy had $48 at first.

Best wishes

[shurley197323]

Thanks Tianzhu. Please explain kindly explain why 9 units ?

What is the reason behind to separate into parts & units ?
Sorry if I sound silly.

[tianzhu]

shurley197323:

Thanks Tianzhu. Please explain kindly explain why 9 units ?

What is the reason behind to separate into parts & units ?

Hi shurley197323

Good Morning.

I tried to rush out the solution in text form last night because of “SOS”.
Units and Parts is used to differentiate the fractions of Wendy and Pei Fen. As seen from the MD, they are of different units of measurement.

Hope this helps.

Best wishes

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[shurley197323]

Hi.Tianzhu. Very very much appreciated. Thanks for all the trouble.