Q&A - PSLE Math

[parents222]

Hi tianzhu, thanks alot for the solution!

[tianzhu]

jewelbox:

Appreciate any help to solve this qn in PSLE bk qn11.

A B C D
1 2 3 4
8 7 6 5
9 10 11 12
16 15 14 13
In which column will the number 432 appear?

Hi

Good Morning.

Try to establish a pattern.

Hope this help.

Best wishes

http://farm8.staticflickr.com/7257/7126347141_369d94bb9d_z.jpg\">

[tianzhu]

parents222:

Hi tianzhu, thanks alot for the solution!

Hi

Good Morning.

You're welcome.

Best wishes

[MathIzzzFun]

small:

Many thanks again MathIzzzFun..


I realised my mistake, thought they were started from different towns.

avec plaisir

cheers.

[Denise]

Denzel, Eugene and Farhan bought a packet of marbles. Denzel received 145 marbles.Farhan received 30% less marbles than Eugene. Later,Denzel gave 68 marbles to Eugene and Farhan to share. After that, Farhan still had 30% fewer marbles than Eugene. The number of marbles Eugene had increased by 25%. How many marbles were there in the packet at first?

[tianzhu]

Denise:

Denzel, Eugene and Farhan bought a packet of marbles. Denzel received 145 marbles.Farhan received 30% less marbles than Eugene. Later,Denzel gave 68 marbles to Eugene and Farhan to share. After that, Farhan still had 30% fewer marbles than Eugene. The number of marbles Eugene had increased by 25%. How many marbles were there in the packet at first?

Hi

You may use MD or work with units.

To avoid working with decimals, use equivalent ratios.

Denzel received 145 marbles

Eugene ------- 40 units
Farhan ------- 28 units

Denzel gave 68 marbles to Eugene and Farhan to share.

Eugene ------- 50 units
Farhan ------- 35 units.

(35+50) – (40+28) ------- 17

17 units ------- 68
1 unit ------- 4

68 units ------- 272

272+145 ------ 417

Best wishes

[Denise]

Thanks. That was fast.

[Winx5015]

Hi, here are some heuristic questions that need help.


(1). Jane saves 25% of her salary each month. Her salary increased by 30% in July. If her savings from July till the end of the year amounted to $3120, how much was her monthly salary before the increment?

(2). Jerry and Mosses each had a certain number of stamps. At first, Mosses had 200 stamps more than Jerry. When Mosses gave away 1/6 of his stamps to Jerry, he had 30 fewer stamps than Jerry. What was the ratio of the number of stamps Jerry had to the number of stamps Jerry had to the number of stamps Mosses had at first?

(3). If Tom sells the watch at a discount of 15% of the marked price, he will make a profit of $8. If he sells it at a discount of 30% of the marked price, he will suffer a loss of $4. Find the cost price of the watch.

Thanks.

[MathIzzzFun]

Winx5015:

Hi, here are some heuristic questions that need help.


(1). Jane saves 25% of her salary each month. Her salary increased by 30% in July. If her savings from July till the end of the year amounted to $3120, how much was her monthly salary before the increment?

(2). Jerry and Mosses each had a certain number of stamps. At first, Mosses had 200 stamps more than Jerry. When Mosses gave away 1/6 of his stamps to Jerry, he had 30 fewer stamps than Jerry. What was the ratio of the number of stamps Jerry had to the number of stamps Jerry had to the number of stamps Mosses had at first?

(3). If Tom sells the watch at a discount of 15% of the marked price, he will make a profit of $8. If he sells it at a discount of 30% of the marked price, he will suffer a loss of $4. Find the cost price of the watch.

Thanks.

Hi

Q1.... Savings per month from Jul - Dec= $3120 / 6 = $520
Savings per month = Salary x 25% x 130% = 0.325 x Salary
so, salary = 520 / 0.325 = $1600

Q2.
After 1/6 of stamps to Jerry,
Mosses's stamps -> 5 units
Jerry's stamps --> 5 units + 30

At first,
Mosses's stamps -> 6 units
Jerry's stamps --> 4 units + 30
so,
6 units = 4 units + 30 + 200
2 units --> 230
Jerry's stamps : Mosses's stamps = 490 : 690 = 49 : 69

Q3.
15% (= 30% - 15%) of marked price = $4 + $8 = $12, you should be able to work out the rest from here..

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cheers.

[superksmum]

Hi, help needed again.


Mr Brown made two real estates sales. The first property was transacted at $800,000, and he gained 10% from it. The second property was transacted at $1,000,000, and the gain was 20%. What was his average gain in percentage for the two properties?

Thanks you