What value of B will make the product equal of 17 in the following expression: 17xb/7

When george started his current job, his employer told him that at the end of the first year, he would receive two vacation days. after each year worked, his number of vacation days will double up to five work weeks (25days) of payed vacation. how many vacation days will he have in 4 years

There were 25 students who answered to a survey about sports. four-fifths of them like football. how many students like football?

Pls the last one and it has to be like number 6