A hammer and a nail cost $1.10, and the hammer costs one dollar more than the nail. How much does the nail cost? 81.
During a test that consisted of 25 questions the student scored 60 points. How many right answers did the student score if for each correct answer he received 5 points, and for each incorrect answer 8 points were subtracted from the total? 82.
The speed of the electric train is 70km/h. Which way is the smoke flying? 83. Read more