1
B's age is twice A's. Six years from now the sum of their ages will be 54 years. How old is each now?
Chapter 4 · Simple Equations
Chapter challenge
Ten problems drawn from every lesson in the chapter. Get each one right on your first try for a perfect score. A new set is drawn each time.
0first-try
0of 10 done
From Word Problems, exercise 17
Choose a letter for one unknown, write the others in terms of it, form an equation, and solve.
From Word Problems, exercise 1
Choose a letter for one unknown, write the others in terms of it, form an equation, and solve.
2
One number is twice another, and the sum of the two is 135. Find both numbers.
From Turning Words into Algebra, exercise 10
Represent each quantity with a letter and numbers.
3
If n is any odd number, what represents the next greater odd number? the odd number before n?
From Word Problems, exercise 15
Choose a letter for one unknown, write the others in terms of it, form an equation, and solve.
4
Find five consecutive odd numbers whose sum is 315.
From Solving Simple Equations, exercise 9
Find the value of the unknown, and check it by substituting back.
5
Solve 13n = -5n + 36. What is n?
From Turning Words into Algebra, exercise 19
Express each statement as an equation. (Don't solve it.)
6
Write as an equation: x is 3 greater than 5.
From Turning Words into Algebra, exercise 8
Represent each quantity with a letter and numbers.
7
If x is the first of four consecutive integers, represent the other three and the sum of all four.
From Turning Words into Algebra, exercise 21
Express each statement as an equation. (Don't solve it.)
8
Write as an equation: Three times x is 21.
From Turning Words into Algebra, exercise 18
Express each statement as an equation. (Don't solve it.)
9
Write as an equation: x is 2 less than 10.
From Solving Simple Equations, exercise 13
Find the value of the unknown, and check it by substituting back.
10
Solve 2y - 3 = 17 - y. What is y?