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Saturday, September 23 2017 @ 11:18 AM CDT
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By: soonteck_01 (offline)  Saturday, February 15 2014 @ 08:02 PM CST (Read 1148 times)  
soonteck_01

Q1.Lixin intends to buy either Gift A,which cost $10 , or Gift B which cost $8 as Christmas
gift for each of her parent, 2 siblings,13 relatives and 10 friends. Given that she intends to spend
$230, find the number of each gift she should buy.


THANKS IN ADVACE Big Grin

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By: echeewh (offline)  Sunday, February 16 2014 @ 05:25 PM CST  
echeewh

Hey <soonteck_01>

My worked solution is as follows:

Apply <Assume ALL> method, we have ...

Assume all Gifts cost $10 each (Gift A),

10 × 27 = $270

D1: 270 - 230 = 40
D2: 10 - 8 = 2

D1 ÷ D2 = 40 ÷ 2 = 20 (of $8 Gift B )

27 - 20 = 7 (of $10 Gift A)

Hence, Lixin should buy 7 Gift A and 20 Gift B.

=========

Alternatively the usual <Guess & Check > method can be used too.

Trust this helps.

Do let me know again if it's different from your <Answerkey> or if there's further clarification.

Cheers,
Edward

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