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(30 - x) kg - solanki 3%
2% × 30 = 3% × (30 - x)
2 × 30 / 100 = 3 × (30 - x) / 100
2× 30 = 3 × (30 - x)
60 = 90 - 3 × x
3 × x = 90 - 60
x = 30 / 3
x = 10 kg