Topic: Statistical methods

In a certain school there are 500 students. The students of the school buy samosa, chips and vegpuffs from their canteen. The following data provides the probability of the students preference of food sold in the canteen.

1. Find x and What is the probability that students buy at least one of the items in the canteen?
2. What is the probability that a student buys chips if the student had already bought samosa?
3. What is the probability that a student buys veg puffs if he had already bought chips?
4. What is the probability that a student buys veg puffs if he had already bought samosa?

Please explain each step in detail.