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Friday, July 21 2017 @ 03:32 PM CDT
 Forum Index >  Test Paper Related >  Primary 6 Matters
 p6 2012 nanyang prelim
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By: tchtby (offline)  Friday, August 09 2013 @ 05:44 AM CDT (Read 719 times)  
tchtby

pls help me solve these 2 qn

thks

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By: echeewh (offline)  Friday, August 09 2013 @ 12:06 PM CDT  
echeewh

Hey <tchtby>,

Following are my worked solutions:

Q15.

*** - for alignment purpose


Each sheet --> 8 photos

(a)
3 sheets --> 3 × 8 = 24 photos

Sheet1 Left ***** : Right
******** 1,2,3,4

Sheet2
******** 5,6,7,8

Sheet3
******** 9,10,11,12 : 13,14,15,16

Hence, photo numbers in the middle of these 3 sheets are:

11, 12, 13, 14

(b)

Photo numbers at the back of this sheet:

21, 22, 51, 52

(c)

Each Left sheet is a multiple of 4 photos (or groups of 4 photos). Likewise for each Right sheet.

From the Front Left numbers of 23, 24, this is the 6th sheet. (24 ÷ 4 = 6)

From the Front Right numbers of 49, 50, the Front Right numbers of the 1st sheet are 69, 70. ( Look at the top right number and increase by multiple of 4 - 50, 54, 58, 62, 66, 70 )

Number of photos in album = 72

=========

Q16.

<Last month>
S = 1 - (1/4) - (9/20) = (20 - 5 - 9)/20
= 6/20 = 3/10

T : F : S
(1/4) : (9/20) : (3/10)

Multiply above ratio 20x.

5 : 9 : 6

Income = 5u + 9u + 6u = 20u

<This month>
Income increased by (1/10).

New Income = (11/10) × 20u = 22u

T: 5u
S: increased by 30%
(130/100) × 6u = 7.8u

7.8u --> $780
1u --> $100

(a)
T = 5u --> 5 × 100 = $500

(b)
F: 22u - 5u - 7.8u = 9.2u
9.2u --> 9.2 × 100 = $920

========

Trust this helps.

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

Cheers,
Edward

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