Answer:
Francisco is 18
Explanation:
call Ted T and Francisco F.
T is 12 years younger than F. So, T = F -12. (call this equation 1)
F is 3 times as old. So, F = 3T (call this equation 2).
sub equation 2 into equation 1:
T= F - 12
= 3T - 12.
So, T = 3T -12
subtract T from both sides:
0 = 3T - T - 12.
Add 12 to both sides:
3T - T = 12
2T = 12
T = 6.
Ted is 6.
Francisco is 3 times as old. So, Francisco is 3 X 6 = 18.