What does each space between two numbers represent

At school there are 526 students and 263 are girls about how likely is it that a randomly chosen student will be a boy

If 10 men take 18 days to mow 60 acres of grass, how long will 15 men take to mow 80 acres?

Someone this asap for a group of students attends a basketball game. * the group buys x hot dogs at the concession stand for $2 each. * the group buys y drinks at the concession stand for $3 each. the group buys 29 items at the concession stand for a total of $70. how many hot dogs did the group buy?