## Q&A - PSLE Math

Academic support for Primary 6 and PSLE
bangs
OrangeBelt
Posts: 37
Joined: Mon Oct 29,
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### Re: Q&A - PSLE Math

Hi,

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Ahmad and Halim together took 5 days to paint their house. If Ahmad and Halim work together for 2 days, followed by Ahmad working alone for 8 days, Halim will take 1 more day to complete the remaining work. How long will Ahmad take to paint the house all by himself?

Ans given: 17.5 days

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Oldschool
GreenBelt
Posts: 139
Joined: Fri Mar 22,

### Re: Q&A - PSLE Math

acehkr3009 wrote:
Oldschool wrote:
acehkr3009 wrote:Hi all,

Will need help on finding the area of the unshaded triangle.

Thanks.

Hi,

Can you find the area of triangle from here?

Regards
Hi,

The triangles are not stated as right angle triangle.
Is it possible to have isosceles triangles inside this quadrant that may not be right angle?
If so, then not too sure how to find area of the triangles....please advise...thks

Hi,

Yes, it is possible to have iso. triangle inside the quadrant that is not a right angle triangle.

So, you have a valid point here. If the iso. triangle is not a rt. angle triangle (since it is stated that is not drawn to scale) them there would be infinite answers.

Regards

YellowBelt
Posts: 13
Joined: Mon Feb 03,

### Re: Q&A - PSLE Math

tianzhu wrote:
ksdad28 wrote:The ratio of the number of fishes to the number of frogs in a pond is 3:5. After 6 frogs left the pond, there were 6/7 as many fishes as frogs. How many fishes and frogs were there altogether in the pond at first?

TIA for helping.

Good Morning

Hope this helps.

Best wishes

Thanks. Ratio is one of my worst topics.

speedmaths.com
BrownBelt
Posts: 559
Joined: Mon Oct 12,
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### Re: Q&A - PSLE Math

bangs wrote:Hi,

-----------
Ahmad and Halim together took 5 days to paint their house. If Ahmad and Halim work together for 2 days, followed by Ahmad working alone for 8 days, Halim will take 1 more day to complete the remaining work. How long will Ahmad take to paint the house all by himself?

Ans given: 17.5 days

-----------
Hi bangs,

http://www.kiasuparents.com/kiasu/forum ... start=3830

Please let us know if you still need help.

Cheers

speedmaths.com
.

sptamila
OrangeBelt
Posts: 58
Joined: Wed Feb 26,
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### Re: Q&A - PSLE Math

bangs wrote:Hi,

-----------
Ahmad and Halim together took 5 days to paint their house. If Ahmad and Halim work together for 2 days, followed by Ahmad working alone for 8 days, Halim will take 1 more day to complete the remaining work. How long will Ahmad take to paint the house all by himself?

Ans given: 17.5 days

-----------
1A +1H ---------- 1/5 of the house painted in 1 day
2day of (Ahamed + Halim) 2A+ 2H ----- 2/5 of the works done.
Remaining paint work 5/5 – 2/5 = 3/5
3 / 5 works -------- A8 days + H 1 day
1day of A + 1 day of H = 1/5 of the house painted --------(1)
8day of A + 1 day of H = 3/5 of the house painted --------(2)
(2) –(1) = 7 day of A = 2/5 of the house paint work
5/5 of the house paint work by A = 5/2 X 7 = 17.5 days

Cheers
SPt

sptamila
OrangeBelt
Posts: 58
Joined: Wed Feb 26,
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### Re: Q&A - PSLE Math

Oldschool wrote:
acehkr3009 wrote:Hi all,

Will need help on finding the area of the unshaded triangle.

Thanks.

Hi,

Can you find the area of triangle from here?

Regards
Here you go
Hi,
Area of the 2 Quadrant = π ×r² / 2
22/ 7 x 20 x 20 / 2 = 628. 57cm² (rounded off)

2 Area of Isosceles triangles = 1 Square
Area of the Square using Diagonal = d²/2
20 x 20 / 2 = 200 cm²

Shaded parts = 628.57 – 200 = 428.57cm²

Cheers
Spt

bangs
OrangeBelt
Posts: 37
Joined: Mon Oct 29,
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### Re: Q&A - PSLE Math

sptamila wrote:
bangs wrote:Hi,

-----------
Ahmad and Halim together took 5 days to paint their house. If Ahmad and Halim work together for 2 days, followed by Ahmad working alone for 8 days, Halim will take 1 more day to complete the remaining work. How long will Ahmad take to paint the house all by himself?

Ans given: 17.5 days

-----------
1A +1H ---------- 1/5 of the house painted in 1 day
2day of (Ahamed + Halim) 2A+ 2H ----- 2/5 of the works done.
Remaining paint work 5/5 – 2/5 = 3/5
3 / 5 works -------- A8 days + H 1 day
1day of A + 1 day of H = 1/5 of the house painted --------(1)
8day of A + 1 day of H = 3/5 of the house painted --------(2)
(2) –(1) = 7 day of A = 2/5 of the house paint work
5/5 of the house paint work by A = 5/2 X 7 = 17.5 days

Cheers
SPt
Thanks for your help in solving and to speedmaths for directing me to a previous post on this same question. Much appreciated!

marstolive
BlueBelt
Posts: 284
Joined: Sun Jan 30,

### Re: Q&A - PSLE Math

A farmer had 160 more chickens than ducks.
After selling 3/4 of the ducks and 50% of the chickens, 230 chickens and ducks were left.

a. how many duck were left
b. what is the ratio of the number of chickens left to the number of ducks left? express your answer in its simplest form.

sptamila
OrangeBelt
Posts: 58
Joined: Wed Feb 26,
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### Re: Q&A - PSLE Math

marstolive wrote: A farmer had 160 more chickens than ducks.
After selling 3/4 of the ducks and 50% of the chickens, 230 chickens and ducks were left.

a. how many duck were left
b. what is the ratio of the number of chickens left to the number of ducks left? express your answer in its simplest form.

Hi,

Cheers!!!
Spt

SOS mum
BlueBelt
Posts: 264
Joined: Thu Aug 01,

### Re: Q&A - PSLE Math

Hi, ps help. TIA

Mr Chen receives a fixed salary every month. He sets aside \$500 for his son's monthly allowance, \$1500 for family expenditure and saves the rest. When he increases his son's allowance by \$64, his savings decreases by 8%. Find his monthly salary.

In an examination, Mary scored an average percentage of 80% for 4 subjects. She got 10 more marks in Chinese than in English. She scored 5 marks more in English than her maths and her science marks were 3/4 that of what she scored for English. How many marks did she score for each subject?