Question 212042
Diego is twice as old as Anna now.
d = 2a
: 
Six years ago, Diego was triple Anna's age.
d - 6 = 3(a-6)
d - 6 = 3a - 18
d = 3a - 18 + 6
d = 3a - 12
:
Find both their present ages please.
:
Substitute 2a for d in the above equation:
2a = 3a - 12
2a - 3a = -12
-a = -12
a = 12 is Anna's present age
then
2(12) = 24 is D's present age
:
:
Check solution in the statement:
"Six years ago, Diego was triple Anna's age."
24 - 6 = 3(12-6)
18 = 3(6)