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02-10-2016
Mathematics

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rob is 5 years older than john,mark is twice as old as john the total of their ages is 65

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SamreenAmdani SamreenAmdani

02-10-2016

John is 15
Rob is 20
Mark is 30

x = John's age
x + 5 = Rob's age
2x = Mark's age

x + x + 5 + 2x = 65
4x + 5 = 65
-5 -5
4x = 60
/4 /4
x = 15
15 + 5 = 20
2(15) = 30

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