A number is divided into two parts in the ratio of 5 ∶ 6 respectively. The sum of 60 percent of first part and 50 percent of second part is 84. If both parts are increased by 10, then what will be the respective ratio between the sum of old numbers and new numbers?
1
71 ∶ 87
2
73 : 87
3
77 : 87
4
75 : 87