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 Forum Index >  Test Paper Related >  Primary 6 Matters P6 Maths ! 2012 Nan Hua SA1 Paper 1 Q12 & Q20
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 By: geniuskids (offline)  Monday, April 29 2013 @ 11:10 AM CDT (Read 858 times)
geniuskids

Hi there, kindly help with these questions:-

(Q12) There are 40 pupils in a class. 15 of them are girls. How many percent more boys than girls are there?
(1) 10%
(2) 25%
(3) 33 2/3%
(4) 66 2/3%

I'm puzzled!

(Q20) Pls refer to the diagram on the test paper. However I did not upload. Pls help solve if you have the diagram. tks

Active Member

Registered: 11/12/11
Posts: 169

 By: echeewh (offline)  Monday, April 29 2013 @ 04:45 PM CDT
echeewh

Hey Geniuskids,

Following pls find my worked solutions:

Q12

Required % = [(B - G) / G] × 100

B = 40 - 15 = 25

Required % = [(25 - 15) / 15] × 100
= (10 / 15) × 100
= (2 / 3) × 100
= 200 / 3
= 66 2/3 %

=========

Q20

Join OM (the other diagonal of the square MNOP).
Length of OM = NP
Radius OM = OS = (x + 3)
Hence, NP = (x + 3) cm

=========

Trust this helps.

Do let me know again if there's further clarification.

Cheer,
Edward

Active Member

Registered: 04/21/11
Posts: 627

 By: echeewh (offline)  Monday, April 29 2013 @ 04:45 PM CDT
echeewh

Hey Geniuskids,

Following pls find my worked solutions:

Q12

Required % = [(B - G) / G] × 100

B = 40 - 15 = 25

Required % = [(25 - 15) / 15] × 100
= (10 / 15) × 100
= (2 / 3) × 100
= 200 / 3
= 66 2/3 %

=========

Q20

Join OM (the other diagonal of the square MNOP).
Length of OM = NP
Radius OM = OS = (x + 3)
Hence, NP = (x + 3) cm

=========

Trust this helps.

Do let me know again if there's further clarification.

Cheer,
Edward

Active Member

Registered: 04/21/11
Posts: 627

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