An average a day

Forest workers planted 96 trees on Monday, 120 trees on Tuesday, and 61 trees on Wednesdays. How many trees did she plant in the last day of Thursday, if she planted an average of 105 trees a day?

Correct answer:

x =  143

Step-by-step explanation:

$$\begin{gathered} {\displaystyle \frac{96+120+61+x}{4}}=105 \\ 96+120+61+x=105\cdot 4 \\ x=143 \end{gathered}$$

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