Question

Tonight, Duane needs to bring home only his math and science textbooks. His project weighs 5 pounds. Find the total weight Duane will carry in his backpack

Answer 1

Since the mathematic textbook weighs 3 3/4 Ib

Since the science textbook weighs 55 oz

We must change 55 oz to Ib

Since 1 oz = 0.0625 Ib, then

55 oz = 55 x 0.0625 = 3 7/16 Ib

Now we will add all to find the total weight

$5+3\frac{3}{4}+3\frac{7}{16}$

Let us add the wholes, then add the fractions

$5+3+3=11$$\begin{gathered} \frac{3}{4}+\frac{7}{16}=\frac{3\times4}{4\times4}+\frac{7}{16}= \\ \frac{12}{16}+\frac{7}{16}=\frac{19}{16} \\ 1\frac{3}{16} \end{gathered}$

Let us add the two answers

$11+1\frac{3}{16}=12\frac{3}{16}$

The total weight is 12 3/16 pounds