SOLUTION: 7 years ago Samuel was three times David's age. in 4 years Samuel will be twice David's age. What is David's age?

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Question 1138215: 7 years ago Samuel was three times David's age. in 4 years Samuel will be twice David's age. What is David's age?
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
m, saMuel
v, daVid
system%28m-7=3%28v-7%29%2Cm%2B4=2%28v%2B4%29%29