A supermarket

A supermarket has 3 7/8 pounds of tangerines. Kelsey buys 1/2 of all the tangerines in the supermarket. How many pounds of tangerines did Kelsey buy?

Correct answer:

x =  1.9375 lb

Step-by-step explanation:

$$\begin{gathered} a=3{\displaystyle \frac{7}{8}}=3+{\displaystyle \frac{7}{8}}={\displaystyle \frac{3\cdot 8+7}{8}}={\displaystyle \frac{31}{8}}=3.875\text{ lb } \\ x={\displaystyle \frac{1}{2}}\cdot a={\displaystyle \frac{1}{2}}\cdot 3.875={\displaystyle \frac{31}{16}}\text{ lb}=1\frac{15}{16}\text{ lb}=1.9375\text{ lb} \end{gathered}$$

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