In a certain city 40% of the people have black hair, 25% have black eyes and 10% have both black hair and black eyes. What percentage of the people in the city have neither black hair nor black eyes?

The ratio of two numbers is 9:15. If the former number is 36 then the next number is:

The sum of three consecutive even numbers is 42 and the sum of three consecutive odd numbers is 51. Find the r...

If a commission of 10% is given to the customer on the catalog price of a book, the publisher gains 20%. If th...

If Shamim were twice as old as he is now, he would be 40 years older than kamal. If Kamal is 10 years younger...

A car travels 330 miles in 6 hours, while the return trip takes 5 hours. What is the average speed i miles per...

What is the value of x if the average of 105, 117, 125 and x is 115?