Section 3.3 Addition and Subtraction of Unlike Fractions 185 Therefore, the current amount in the tank is given by b aamount Write the whole number as a fraction. The LCD is 16. The fractions are now like fractions. Add and subtract as indicated. The fraction is in lowest terms. aoriginal amount 2 2 1 7 16 7 16 2 16 1 16 32 16 b aamount 7 16 3 8 3 8 7 16 32 7 6 15 16 115 16 31 16 16 or 1 6 16 Current amount The tank now contains L. lost 3 2 8 2 Finding Perimeter Example 9 A parcel of land has the following dimensions. Find the perimeter. Solution: To find the perimeter, add the lengths of the sides. The LCD is 24. Convert to like fractions. Add the fractions. 1 8 mi Simplify to lowest terms. 1 4 1 3 8 3 3 24 27 24 9 8 5 12 1 3 1 6 4 6 6 24 or 1 1 8 10 24 5 2 12 2 8 24 1 8 3 8 1 8 The perimeter is mi.section 3. 118 replaced b TIP: For Example 8, both L and L are correct answers but, in general, we will give the answer to an application as a mixed number as opposed to an improper fraction. 3 4 mi 12 Answer 10. They hiked 11 2 mi or equivalently 5mi. 115 16 31 16 Skill Practice 10. Twelve members of a college hiking club hiked the perimeter of a canyon. How far did they hike? 7 8 mi 5 4 mi 3 2 mi 9 8 mi 1 3 mi 1 4 mi 5 12 mi
miller_basic_college_math_3e_ch1_3
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