## Q&A - PSLE Math

Academic support for Primary 6 and PSLE
Ender
BrownBelt Posts: 727
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### Re: Q&A - PSLE Math

sushi88 wrote:Q14, Catherine was 8 minutes faster than Betty, not longer.

BigDevil
ClassMonitor Posts: 9244
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### Re: Q&A - PSLE Math

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

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

180 - 89 = 91

Ender
BrownBelt Posts: 727
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### Re: Q&A - PSLE Math

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

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

180 - 89 = 91
Thanks for the correction... Reminds me to use calculator next time..

wilburlim
OrangeBelt Posts: 53
Joined: Wed Jan 11,

### Re: Q&A - PSLE Math

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? Ender
BrownBelt Posts: 727
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### Re: Q&A - PSLE Math

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
BlueBelt Posts: 264
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### Re: Q&A - PSLE Math

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
BrownBelt Posts: 727
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### Re: Q&A - PSLE Math

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
OrangeBelt Posts: 53
Joined: Wed Jan 11,

### Re: Q&A - PSLE Math

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? Ender
BrownBelt Posts: 727
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### Re: Q&A - PSLE Math

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. 