Question

Ming bought a watermelon with the mass of 6 kilograms she cut off the rind the remaining watermelon had a mass of 2500 grams what was the mass of the rind

Answer 1

First we convert 6 kg to grams which should be 6000 grams, since there are 1000 grams in one kg. 

Subtract 2500 from 6000 and we get 3500 grams, which is your answer