Duplicate of Writing equations from word problems

Write an equation for the word problem.

You bought a book for $5 and 4 erasers. You spent a total of $25. How much was each eraser?

The sum of three consecutive numbers is 87. What are the smallest of these numbers?

Write an equation.

The perimeter of a rectangle is 30 in. If its length is three times its width, find the length.

Bob’s phone bill is made up of a $30 fee plus $0.10 per minute. Bob’s bill for July was $45.

Write an equation.