Answer: 32 sweets
[] The ratio 5:2 goes in the word "toys and sweets" as it is said in the sentence.
-> 5 toys for every 2 sweets
[] We know we will have 16 bags in total. She has exactly enough toys
-> 16 bags in total * 5 toys per bag = 80 toys
[] Because of this, we can multiply 2 by 16 to see how many sweets will be needed.
-> 16 bags in total * 2 sweets per bag = 32 sweets