There is a group of 5 boys and 2 girls. The two groups working together can do four times as much work as a boy and a girl. Ratio of working capacities of a boy and a girl is:

• ক 5 : 1
• খ 3 : 1
• গ 2 : 1 ✅ সঠিক উত্তর
• ঘ 2 : 3