Oksana can complete some work in 60 days, while Alicja can complete the same work in 40 days. They started the work together, and when the work was half complete, Alicja fell ill and Oksana had to finish the remaining work. How long did it take to complete the work?
The graph below shows the temperature (in degrees Celsius) over 10 weeks in Berlin and Frankfurt. Find the difference in the temperature of two cities in the week when the difference is minimum.
A shopkeeper mixes two variants of sugar in the ratio 3:2. The first variant costs 25 per kg, while the other costs 30 per kg. If the mixed sugar is sold at the price of 33.75 per kg then find the profit/loss percent incurred by shopkeeper.
Number of students in a hostel increases by 20% every year. If there are 600 students in the hostel, find the number of students in hostel after 2 years.