Mark's father is 55. This is 15 years older than twice Mark's age. How old is Mark? Explain the method used for solving the problem. Include a restatement of the problem, the steps you used to solve the problem, the answer, and an explanation of how you know the answer is correct.

Question

Mathematics

Jimena

8 November, 03:18

Mark's father is 55. This is 15 years older than twice Mark's age. How old is Mark? Explain the method used for solving the problem. Include a restatement of the problem, the steps you used to solve the problem, the answer, and an explanation of how you know the answer is correct.

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Answers (1)

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Kadyn · Answer 1

Mark's father is 55. f=55

And this is equal to twice Mark's age plus 15, f=2m+15

Since f=f we can say

2m+15=55 subtract 15 from both sides

2m=40 divide both sides by 2

m=20

So mark is twenty years old.

We can check ...

2m+15=55, since m=20 this becomes

2 (20) + 15=55

40+15=55

55=55