The number of chickens raised in the farm is 5 / 12 of the total number of chickens and ducks. 74 ducks were sold. At this time, the ratio of the number of chickens to the total number of chickens and ducks is 6:7. How many chickens were there? We need formula and diagram

5/12=35/84
6：7=6/7
6/7=72/84
84-35=49
84-72=12
49-12=37
37÷84=37/84
74 △ 37 △ 84 = 168
168 * (5 / 12) = 70
A: there were 70 chickens

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