Final answer:
To find the number of sweets normally in a bag, we can set up an equation using the information given and solve for the unknown. Normally, there are 20 sweets in a bag.
Step-by-step explanation:
To find the number of sweets normally in a bag, we need to understand that during the promotion, bags of sweets contain 10% extra free. Let's say the normal number of sweets in a bag is x. During the promotion, the bag contains an extra 10% of x, which is 0.10x. Therefore, the total number of sweets in the bag during the promotion is x + 0.10x = 22.
Simplifying the equation, we get 1.10x = 22. Dividing both sides of the equation by 1.10, we find that x = 20. Therefore, normally there are 20 sweets in a bag.