Word problems of Linear equation in one variable

The sum of two consecutive even numbers is 110. Find the smaller number.

A number is 4 times another. If their sum is 70. Find the larger number.

A father is four times as old as his daughter. If the difference in their ages is 63 years. Find the sum of their ages.

The sum of three consecutive numbers is 78. What is the largest number?

A mother is six times as old as her son. If the sum of their ages is 84 years. Find the difference of their ages.

If I subtract 20 from twice a certain number, the result is 80. What is the number?