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Not sure how to draw model here. Need to have before and after model.

Before :
Daniel : 10 units + $160
Alex : 10 units

After :
Daniel : 3 parts
Alex : 1 part

Since Daniel gives 1/10 to Alex, he has given (1 unit + $16) to Alex

In the “After” model,

1 part (for Alex) = 11 units + $16
3 parts (for Daniel) = 9 units + $144 ; ie. 1 part for Daniel is 3 units + $48

The difference is 2 parts : this is the key

2(11units + 16) = 6 units + $96
22 units + $32 = 6 units + $96
16 units = $64
1 unit = $4

At first,
Alex has 10 units = 10 X $4 = $40
Daniel has 10 units + $160 = $40 + $160 = $200.

Ref: http://www.kiasuparents.com/kiasu/forum/viewtopic.php?p=1814#p1814

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