Petya counted in the room of 20 mosquitoes. At the same time 70% of mosquitoes fly and the others sit. How many mosquitoes fly?

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100 - 20 mosquitoes 70 - mosquitoes 100 - 70 = 30 - mosquitoes Resheniye: 1) 100 - 70 = 30 - mosquitoes 2 sits) (20: 100) * 30 = 6 mosquitoes - 30 3) 6: 3 = 2 mosquitoes - 10 4) 2 * 7 = 14 mosquitoes - 70 Answer: 14 komarov20*0.7 = 14 mosquitoes fly. 20 - 14 = 6 mosquitoes sit .
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Answer add