Jenny bought some stamps. She spent one-third of the original amount plus $5 in the first store, one-third of what was left plus $5 in the second store, and one-fifth of what was left in the third store, leaving her with $20. How much money did she start with?

Amayoral candidate would like to know her residents’ views on a tax on sugar drinks before the mayoral debates. she asks one thousand registered voters from both parties. these voters are an example of a census population convenience sample simple random sample