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kiruha [24]
3 years ago
10

Twenty planes are at an airport. Eight planes take off, then five planes land, then 7

Mathematics
1 answer:
steposvetlana [31]3 years ago
4 0

Answer:

19

Step-by-step explanation:

20 - 8 = 12

12 + 5 = 17

17 - 7 = 10

10 + 9 = 19

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