14) 4.5a = 9.0 15) 4.8b = 36

Problem Solving Strategy: Write an Equation

Write an equation for each problem using the variable -n. Then solve and check the equation.

16) Allan has 84 baseball cards. This is 19 fewer cards than Mike. How many baseball cards does Mike have?

17) Jamie can ride her bike 3 times as fast as Michelle can jog. If Jamie rides her bike at a rate of 12 miles per hour, how fast can Michelle jog?

Problem Solving Strategy: Mental Math

Study each equation, then solve.

18) 5 + r = 6 - r

19) z - 16 = - 16

20) 7n - 7 = 0