Answer:
628
Step-by-step explanation:
using formula 1/3 x pi x r x r x h
1/3 x 3.14 x 10 x 10 x 6 = 628
If the number of days is d and he writes 3 pages for every d, then we can say
3d = 81
You just have to add 30 to the total of seats. Good luck.
Answer:a+b
Step-by-step explanation:
You can use the variables a and b to solve your equation if you need