Arecipe uses 5/8kg of flour to make 10 cakes.
how much is needed to make 30 cakes?

10 cakes required  5/8 kg of flour.

1 cake would require    (5/8) /10 = 5/8 * 1/10 = 1/16  kg of flour

30 cakes would then require  =    30 * 1/16 = 30/16 =  15/8 kg

30 cakes would require 15/8 kg of flour.

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