SOLUTION: David is 5 years younger than twice Miguel's age. David 31. How old is Miguel.

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Question 1007628: David is 5 years younger than twice Miguel's age. David 31. How old is Miguel.
Answer by fractalier(6550) About Me  (Show Source):
You can put this solution on YOUR website!
Call their ages D and M. Then we have
D = 2M - 5
and if David is 31, then we have
31 = 2M - 5
add five to both sides, then divide by two and get
36 = 2M
M = 18 years old