Team

The football team has 11 players. Their average age is 20 years. During the match, one player withdraws due to injury, and the team's average age is 18.

How old was the injured player?

Correct answer:

x =  40

Step-by-step explanation:

$$\begin{gathered} \frac{s+x}{11}=20 \\ \frac{s}{10}=18 \\ x=11\cdot 20-10\cdot 18=40 \end{gathered}$$

(s+x)/11=20
s/10=18

s+x = 220
s = 180

Row 2 - Row 1 → Row 2
s+x = 220
-x = -40


x = -40/-1 = 40
s = 220-x = 220-40 = 180

s = 180
x = 40

Our linear equations calculator calculates it.

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