In 1 kg mixture of sand and iron, 23% is iron. How much sand should be added so that the proportion of iron becomes 13%

In 1 kg mixture of sand and iron, 23% is iron. How much sand should be added so that the proportion of iron becomes 13%
1). 769.2 gms
2). 800 gms
3). 760.92 gms
4). Data insufficient

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