Помогите по математике

Напишите плюсы и минусы аэростатов(воздушных шаров),помогите пожалуйста

1. research worker 2. well-ordered

3. majority 4. firmly

5. were convinced 6. particles

7. advanced 8. realized

9. unsuccessful 10. to exercise

11. to influence 12. could not bear

13. had been appointed 14. disorder

15. comparison 16. according

17. similarity 18. applied

19. increasing 20. insight

21. for example 22. weight

23. tools 24. nucleus

25. lucidly 26. density

a) to affect b) investigator

c) were sure d) unlucky

e) resolutely f) progressive

g) had been given a position h) instruments

i) for instance j) centre

k) very small bits l) understood

m) to exert n) chaos

o) likeness p) making greater

q) collation r) properly organized

s) in agreement with t) thickness

u) used v) disliked very much

w) intuitive cognition x) heaviness

y) clearly z) a greater number

гречка содержит 45% крахмала, а рис 65%. сколько нужно взять гречки. чтобы получать столько же крахмала, сколько содержиться его в 8кг риса?