Answer:
2x + 7 = 25
x = 7
Explanation:
Gary: 25
Sean: x
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Let's break down the sentence into mathematical terms
Gary is 25 years old. That is 7 more than twice Sean's age.
In math, is means equal to. It is represented with an equal sign (=)
Gary = 25. 25 = 7 more than twice Sean's age.
7 more is represented by 7 +
Gary = 25. 25 = 7 + than twice Sean's age.
Twice means double which is 2 ·
Gary = 25. 25 = 7 + 2 · Sean's Age
Sean's Age will be represented by x
Gary = 25. 25 = 7 + 2x
We don't need it to say "Gary = 25" in our equation.
25 = 7 + 2x
Let's rewrite it with the associative property.
2x + 7 = 25
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Now, solve
2x + 7 = 25
-7 -7
2x = 18
÷2 ÷2
x = 7
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Sean is 7 years old.