Find the ratio of 15kg to 210g

Answer = 700

for getting the ratio the first condition is that the units shud be same so first 
convert 15kg into g i.e 15000
find the ratio
15000: 210
500:7g

Question-
Find ratio of 15 kg to 210 g
Solution
1 kg - 1000 g
15 kg - 15000 g

15000-210
1500-21
500-7

Regards
K.R.Hari Krishna
Amrita Vidyalayam
Chennai