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3 boys have total 189 marbles

(a)  Each boy has 189/3 = 63 marbles in the end.

(b)    1/6 (to Halim)  = 4/24   and   1/4 (to Sam) = 6/24

 [—-4u—–][———–6u————][———————14u———————]    = 24u

    to Halim             to Sam                                    In the end left for Zach

14u = 63

u = 4.5

24 u = 24 x 4.5 = 108 

Zach has 108 marbles at first.

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