I need help on this quick

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

Is the figure congruent? yes or no?

Barney & noblet customers can choose to purchase a membership for $25 per year members receive 10% off all store purchases 1. how much would a member pay per year if he bought $50 worth of items each year? 2. write a slope-intercept equation that expresses how much a member pays per year using x to represent his purchases per year 3. how much would a member have to spend per year to pay off his membership fee?