Question 857697
Ten years ago:
x   - Anna's age
3x  - Bob's age

Present:
x+10   - Anna's age
3x+10  - Bob's age

Therefore:

{{{3x+10 = 2(x+10)}}}
{{{3x+10 = 2x+20)}}}
{{{x = 10)}}}

Therefore their ages now are:
Bob  = 3x+10 = 40 y.o.
Anna = x+10 = 20 y.o.

HOPE THAT HELPS!

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