Вопрос школьника по предмету Математика
Петя насчитал в комнате 20 комаров.При этом 70% комаров летают а остальные сидят. Сколько комаров летает?
Ответ учителя по предмету Математика
100% — 20 комаров
70 % — ? комаров
100 — 70 = 30 % — ? комаров
Решение:
1) 100% — 70% = 30% — комаров сидит
2) (20 : 100) * 30 = 6 комаров — 30 %
3) 6 : 3 = 2 комара — 10%
4) 2 * 7 = 14 комаров — 70%
Ответ: 14 комаров
Похожие вопросы от пользователей
1. If Peter __________ (come) to my place, we__________ (go) to play in the yard.
2. If Peter__________ (not come) to my place, I __________ (watch) TV.
3. If Frank’s parents__________ (have) their holidays in summer, they __________ (go) to the seaside.
4. If they __________ (have) their holidays in winter, they __________ (stay) at home.
5. If the fog _______ (thicken), Harold _______ (put up) the tent for the night.
6. When I _______ (finish) my work, I_______ (go) to the cinema.
7. We_______ (buy) this book as soon as our mother_______ (give) us some money.
8. When we _______ (come) to your place you_______ (show) us your present.
9. I_______ (return) you your ring when you_______ (ask) me.
10. I_______ (wait) for my friend until he_______ (come) from the shop.
11. My father_______ (start) writing before the sun _______ (rise).
12. As soon as you _______ (finish) your study I_______ (present) you with a new flat.