Big Ideas Math: Modeling Real Life, Grade 7
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Big Ideas Math: Modeling Real Life, Grade 7 View details
4. Writing and Solving Proportions
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Exercise 15 Page 208

Use the Multiplication Property of Equality to eliminate the division.

b=20, see solution.

Practice makes perfect
Notice that in the given equation b is only present within the numerator of a single fraction. b/36 = 5/9 Let's use the Multiplication Property of Equality and multiply multiply both sides of the equation by 36. This will eliminate the denominator of the fraction and isolate b.
b/36 = 5/9
36 * b/36 = 36 * 5/9
b = 36 * 5/9
b = 180/9
b = 20