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 23 Page 208

Use the Multiplication Property of Equality to eliminate the division.

d=15, see solution.

Practice makes perfect
Notice that in the given equation d is only present within the numerator of a single fraction. 20/16 = d/12 Let's use the Multiplication Property of Equality and multiply multiply both sides of the equation by 12. This will eliminate the denominator of the fraction and isolate d.
20/16 = d/12
12*20/16 = 12 * d/12
12*20/16 = d
240/16 = d
15 = d
d=15