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Since we know that
1kg = 1000 gm
so 15kg = 15*1000 = 15000 gm
Now 15kg/210 gm = 15000/210
= 1500/21 (15000 and 210 is divided by 10)
= 500/7 (1500 and 21 is divided by 3)
So 15kg:210gm = 500:7