so the reason i got it was: Laura is 3 times as old as Maria was when Laura was as old as Maria is now
so when laura was 18, maria was 6, thus 3 times older
thus making their present ages 18 = maria, and 30 laura
in 2 yrs. Laura will be twice as old as Maria was 2 yrs ago
in two years laura will be 32, and two years ago maria was 16, thus double
i basically did guess and check for a few ages