Solve the problems and graph them

Ineed with this problem 21 show steps

In a sale there is 25% of all prices a chair costs £45 in sale how much was it before the sale

Were only 64 seats. the remaining 6 students had to travel in a separate van. the equation 2b + 6 = 70 represents the given scenario. what does b represent? the number of buses the number of vans the number of students who rode on each bus the total number of students going to the football game