Pre-Algebra Demystified

13. Solve

x

7

¼13.

(a) 2

(b) 91

(c) 
 78

(d) 42

14. Solve 4xþ 6 ¼
    34.
    (a)
    10
    (b) 10
    (c)
    7
    (d) 7


15. Solve 3(2x
    9)¼45.
    (a) 9
    (b)
    9
    (c)
    12
    (d) 12


16. Solve 5xþ 4
    2x¼ 28
    3x
    (a) 8
    (b) 4
    (c)
    4
    (d)
    12


17. Represent algebraically two numbers so that one is 7 less than three
    times the other.
    (a) x, 3(x
    7)
    (b) x, 3x
    (c) x, 3xþ 7
    (d) x, 3x
    7


18. The sum of two numbers is 30. If one number is 8 more than the other
    number, find the numbers.
    (a) 8, 22
    (b) 7, 23
    (c) 11, 19
    (d) 8, 16


19. What percent of 32 is 24? Solve using an equation.
    (a) 25%
    (b) 133.3%
    (c) 125%
    (d) 75%

CHAPTER 7 Expression and Equations 151