The ratio of the present ages of Tina and Bina is 9 : 10 respectively. Twenty years ago, the ratio of their ages was 4 : 5 respectively. What is the present age of Bina?

• ক 30 years
• খ 35 years
• গ 40 years ✅ সঠিক উত্তর
• ঘ 42 years