How many days are there in y weeks y days? 

If the roots of the equation x^2 - 9x + 20 = 0 are a and b, find the value of a^2 + b^2 + ab.

The highest common factor (HCF) of a pair of coprime numbers is always equal to:

A person walks at 10 km/hr. If they walked at 14 km/hr instead, they would have covered 20 km more. What is the actual distance traveled by the person?

Tickets numbered 1 to 20 are mixed up and then a ticket is drawn at random. What is the probability that the ticket drawn has a number which is a multiple of 3 or 5?

In an examination, 65.8% of candidates took physics and 59.2% took mathematics. The total number of candidates was 2000. How many candidates took both physics and mathematics?

Salaries of Kavi and Amit are in the ratio 3:4. If the salary of each is increased by Rs. 3,000, the new ratio becomes 40:57. What is Amit's present salary?

A and B together can complete a piece of work in 25 days, while A alone can complete the same work in 60 days. How many days will it take for B alone to complete the same work?

Ram can paint his house in 30 days, while Mohan can do the same in 50 days. Mohan worked on the painting for 9 days. How many more days will Ram require to finish the remaining work?

A and B can do a piece of work in 10 days, B and C can do the same work in 20 days, and A and C can do the same work together in 60 days. Find the time taken by A, B, and C to complete the work together.