Answer: 210 sweets
Explanation:
First you would multiply 20 by 3 because 20 is 1/3 of a number and you need to find the 3/3. That will give you 60. Than, because you have 2/7 and 2 does not go into 7, you divide 60 by two to get 1/7. You get 30 and than you multiply it by 7 to get 210.