The sum of two numbers is 36. one number is 2 times as large as the other. what are the numbers?

Sanya noticed that the temperature was falling at a steady rate of 1.4 degrees every hour from the time that she first checked her outdoor thermometer. by 6 a.m., the temperature had fallen 21 degrees. which expression can you use to find how many hours earlier she had first checked the thermometer?

Solve 3x-18=2y and 5x-6y=6 by elimination show work

In a class, there are 12 girls. if the ratio of boys to girls is 5: 4 how many boys are there in the class