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Given data:

A namkeen mixture contains 250.785 gm roasted chana, 225.802 gm roasted moong and 300.005 gm roasted peanuts.

Now we have to find out the grams of roasted corn flakes should be added so that the weight of the mixture is 1 Kg.

As we all know that in 1 kg there are 1000 grams.

Let X grams of roasted corn flakes are added in the mixture.

So the sum of all the elements in the mixture is equal to 1 kg i.e. 1000 grams.

Therefore, roasted chana + roasted moong + roasted peanuts + roasted corn flakes = 1000 grams.

Now substitute the values we have,

$ \Rightarrow 250.785 + 225.802 + 300.005 + X = 1000$

Now simplify it we have,

$ \Rightarrow X = 1000 - 776.592 = 223.408$ Grams.