Two years ago, Maria was 3 times her sister. Two years from now their ages sum to 32.<br><br>[[model:questions/solutions/q4195.png]]<br><br>• Let sister 2 yrs ago = 1 unit; Maria = 3 units<br>• Two yrs from now: sister = 1u + 4, Maria = 3u + 4<br>• Sum = 4u + 8 = 32 → 4u = 24 → 1u = 6<br>• Maria now = 3 × 6 + 2 = 20<br><br>Maria is 20 years old.<br>Check: Sister now 8; 2 yrs ago: Maria 18, sister 6 (3x); 2 yrs from now: 22+10=32. ✓