How many eggs can be present in an embryo sac and how many embryo sacs can be present in an ovule?

1. Usually one egg is present in a normal angiospermic embryo sac. 
2. There is one embryo sac in each ovule. 
3. The number of ovules in an ovary is different for different plant species. Some plants like mango, wheat and rice have a single ovule in an ovary. Some plants like hibiscus and peas have many ovules in an ovary. 
There can be a single ovary in a plant for example mango and apple. There can be many ovaries in a plant like raspberry and strawberry.