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

Alicia Skinner

26 October, 02:09

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 (2)

Know the Answer?

Miguel Cox · Answer 1

Mark is 20. 55 - 15 = 40, 40 / 2 = 20. Mark is 20

Jean Sheppard · Answer 2

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