Acommunity theater group put on a play last month. twenty more adults attended than children. adult tickets cost $8 each and children's tickets cost $3 each. the theater group collected $1,260. how many adults tickets were sold?

Rachel is studying the population of a particular bird species in a national park. she observes every 10th bird of that species that she can find in the park. her conclusion is that the birds living in the park who belong to that species generally feed on insects. rachel's sample is . based on the sample she picked, rachel's generalization is