Q&A - PSLE Math

Academic support for Primary 6 and PSLE
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Ender
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Re: Q&A - PSLE Math

Post by Ender » Sun Aug 28, 2016 10:04 pm

sushi88 wrote:Q14, Catherine was 8 minutes faster than Betty, not longer.
My bad, read the question wrongly.

Answer should be 2) then,

BigDevil
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Re: Q&A - PSLE Math

Post by BigDevil » Mon Aug 29, 2016 9:53 am

Ender wrote:
questionable_i wrote:Can anyone help me with these questions? Thank you
Image
13)
(43+∠CDE) + (48 +∠DCE) = 180
∠CDE + ∠DCE = 180 - 43 - 48 = 89

(∠CDE + ∠DCE) + ∠CED = 180
89 + ∠CED = 180
∠CED = 180 - 89 = 101 ##
Image
∠CED = 43 + 48 = 91

Ender made a calculation error.
180 - 89 = 91

Ender
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Re: Q&A - PSLE Math

Post by Ender » Mon Aug 29, 2016 9:59 am

BigDevil wrote:
Ender wrote:
questionable_i wrote:Can anyone help me with these questions? Thank you
Image
13)
(43+∠CDE) + (48 +∠DCE) = 180
∠CDE + ∠DCE = 180 - 43 - 48 = 89

(∠CDE + ∠DCE) + ∠CED = 180
89 + ∠CED = 180
∠CED = 180 - 89 = 101 ##
Image
∠CED = 43 + 48 = 91

Ender made a calculation error.
180 - 89 = 91
Thanks for the correction... Reminds me to use calculator next time..

wilburlim
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Re: Q&A - PSLE Math

Post by wilburlim » Mon Aug 29, 2016 8:51 pm

Hello I need help for this question:

A survey carried out by a school revealed that 1185 of the pupils walk to school every day. 70% of the remaining pupils go to school by bus while the rest of the pupils go to school by car. Given that 1/5 of the school enrolment goes to school by car, what is the enrolment of the school?
:thankyou:

Ender
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Re: Q&A - PSLE Math

Post by Ender » Mon Aug 29, 2016 9:42 pm

Let pupils that goes to school by bus and car altogether be 100u,
Then those by bus will be 70u and
by cars will be 30u

30u (by cars) are 1/5 of the schools enrolment.
Therefore school enrolment is = 30u X 5 = 150u

Those who walk = 150u - 100u = 50u
50u = 1185
u = 23.7

school enrolment = 150u = 3555 ###


SOS mum
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Re: Q&A - PSLE Math

Post by SOS mum » Tue Aug 30, 2016 4:52 pm

Hi, ps help. Many tks and God Bless:)

Yee Leng has some twenty cents and fifty cents coins.
2/3 of the total value of the twenty cents coins is the same as 1/2 of the total value of the fifty cents coins. If Yee Leng spends 4 fifty cent coins, the value of the twenty cents coins and the value of the remaining fifty cents coins will be the same. How many twenty cents coins does Yee Leng have?

Ender
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Re: Q&A - PSLE Math

Post by Ender » Tue Aug 30, 2016 5:22 pm

SOS mum wrote:Hi, ps help. Many tks and God Bless:)

Yee Leng has some twenty cents and fifty cents coins.
2/3 of the total value of the twenty cents coins is the same as 1/2 of the total value of the fifty cents coins. If Yee Leng spends 4 fifty cent coins, the value of the twenty cents coins and the value of the remaining fifty cents coins will be the same. How many twenty cents coins does Yee Leng have?
The value of 2/3 twenty cent equals to half of fifty cents value, can be modelled as
Value of 20c = 3u
Value of 50c = 4u
Becoz 2/3 of 3u = 2u, which is half of the value of 50c coins. Therefore value of 50c is 2u x 2 = 4u
Spent 4 fifty cent is just another way of saying he spent $2.

4u - 3u = $2
1u= $2

Value of 20c = 3u = $6

Number of 20c coins = 6/0.2 = 30 ##.

wilburlim
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Re: Q&A - PSLE Math

Post by wilburlim » Tue Aug 30, 2016 6:33 pm

Thank you! I have one more question--

Mr Chan spent $2500 of her salary and saved the rest. When she increased her spending by 30%, her savings decreased by 25%. How much was her salary?
:thankyou:

Ender
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Re: Q&A - PSLE Math

Post by Ender » Tue Aug 30, 2016 8:43 pm

wilburlim wrote:Thank you! I have one more question--

When she increased her spending by 30%, her savings decreased by 25%.
The above statement is mathematically saying this,
30% of $2500 = 1/4 of Saving at first

So "saving at first" is ________ ?

Hope you can solve from here.


Answer $5500
Last edited by Ender on Tue Aug 30, 2016 10:07 pm, edited 1 time in total.

wilburlim
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Re: Q&A - PSLE Math

Post by wilburlim » Tue Aug 30, 2016 8:58 pm

Question: Keira had $60 more than Jo. When Koera gave 2/5 of her money to Jo, Jo had $4 more than Kiera. How much money did Jo have initially?

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