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Wednesday, June 28 2017 @ 01:58 AM CDT
 Forum Index >  Test Paper Related >  Primary 5 Matters
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By: achieve_goal (offline)  Tuesday, May 01 2012 @ 04:08 AM CDT (Read 842 times)  
achieve_goal

Hi, please help me.


Q1. Grandma had some yellow and purple sweets in the ratio of 9:7.
On Monday, she made 54 more yellow sweets. On tuesday, she
gave away 44 purple sweets and sold 129 yellow sweets. The number of
yellow sweets to the number of purple sweets became in the
ratio of 6:5. how many yellow sweets are there in the end?


Q2. there are some crystal and glass marbles in a pouch.If 3 crystal marbles
are removed from the pouch,the number of crystal marbles left will be 1/6
of the glass marbles left.If 5 glass marbles are removed from the pouch,
the number of crystal marbles left will be 1/4 of the glass marbles left.
How many marbles are there in the pouch at first?

please help me.

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By: echeewh (offline)  Tuesday, May 01 2012 @ 08:18 PM CDT  
echeewh

Hey there,

Following pls find the worked solution for Q1.

Q1.

<Before>
Y : P
9 : 7

<Process>
Y: +54-129 = -75
P: -44

<After>
6 : 5

Two methods / techniques can be used; (i) Cross-Multiply or (ii) Simultaneous
We used method (i) here.

( 9u - 75 ) / 6 = ( 7u - 44 ) / 5
5 x ( 9u - 75 ) = 6 x ( 7u - 44 )
45u - 375 = 42u - 264
45u - 42u --> 375 - 264
3u --> 111
1u --> 37

Y (end) = 9u - 75 --> ( 9 x 37 ) - 75
= 333 - 75
= 258

=========================================

Trust the above helps. Btw do u have the answerkey for Q2 ??

Cheers,
Edward

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