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Let, their investments are = x, y & z

The first partner's investment will be 14x Tk.

Second partner's investment will be 8y Tk. 

Third partner's investment will be 7z Tk.

So we get from above information, 14x8y=57

=7x4y=57 =xy=2049 x : y = 20 : 49 Again, 8y7z=78 =yz=4964 y : z = 49 : 64 x : y : x = 20 : 49 : 64

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