Answer :

StayAliveFren

Answer:

Bob is 17 years old

Mary is 22 years old

Step-by-step explanation:

Mary's current age: m

Bob's current age: b

m + b = 39

m = b + 5

Substitute.

b + 5 + b = 39

2b + 5 = 39

2b = 34

b = 17

m = 22

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