SOLUTION: In fifteen years time ,John Will be N years old.if Mary is 4 years older than John.What is Mary's age in 10 years ago

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Question 1167494: In fifteen years time ,John Will be N years old.if Mary is 4 years older than John.What is Mary's age in 10 years ago
Answer by josgarithmetic(39617) About Me  (Show Source):
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In fifteen years time ,John Will be N years old.if Mary is 4 years older than John.What is Mary's age in 10 years ago
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In p years time j will be N years old.
If m is k years older than j, what will be m-g?
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system%28j%2Bp=N%2Cm=j%2Bk%29

j=N-p
-
m=N-p%2Bk

g years ago, m-g=highlight%28N-p%2Bk-g%29


N-15%2B4-10
highlight%28N-21%29

No value for given for N.