The number 21 is decreased to 15. what is the percentage by which the number was decreased, to the nearest tenth of a percent?

Five dinosaurs go for a walk and come across some lovely chicken wings. their names are rexy, bronto, steggy, paly, and terry. there are exactly 5 dozen wings(equal enough for each dino to have a dozen right? ); however, terry is on a diet and he only eats 6 wings. if paly eats 2 more than terry, steggy eats 4 more than paly, and bronto and rexy eat the same amount because they are really hungry from not eating all day, how many chicken wings did each dino eat?

Kira looked through online census information to determine the overage number of people living in the homes in her city what is true about kira's data collection?

Ithink i know it but i want to be sure so can you me out ?