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Monday, August 21 2017 @ 01:42 AM CDT
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 Need help on Tao Nan paper question.
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By: willgtohelp (offline)  Friday, January 10 2014 @ 01:01 AM CST (Read 1320 times)  
willgtohelp

Ali is 8 years older than Muthu.In 6 years time, Ali will be twice as old as Muthu. How old is Muthu now?

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By: echeewh (offline)  Friday, January 10 2014 @ 07:11 PM CST  
echeewh

Hi <willgtohelp>,

Following is my worked solution:

** - for alignment purpose


<Now>
A |-----|<-- 8 -->|
M |-----|

<6 years later>
A |-----|<-- 8 -->|<- 6 ->|
M |-----|<- 6 ->|
** <1u>

Referring to the <6 years later> model,

A = 1u + 14
M = 1u + 6

Given that Ali (A) will be twice as old as Muthu (M), we have ...

1u + 14 = 2 × (1u + 6) = 1u + 6 + 1u + 6
1u + 14 = 2u + 12
2u - 1u --> 14 - 12
1u --> 2

Hence, M's age (now) = 1u --> 2 years old

=========

Trust this helps.

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

Cheers,
Edward

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