WHY do you think Water, marbles, and sand are a solution?

solution:

→c= a b , that is product of a and b is possible only when when a is m × n matrix and b is n × p matrix.

that is, number of columns of a= number of rows of b.

so, size of matrix , c= a b is , if a = (m × n)matrix

b= (n × p)matrix

then a b = [ (m × n)matrix] ×[   (n × p)matrix ]

→→c= a b= [m × p ] matrix

→→size of product a b will be equal to = number of rows of a × number of columns of b

i'm pretty sure the answer is a. decreases with increase in

4n=2m

ratio of m to n: 2/4 = 1/2

answer

a. 1/2

210/22 = 9.55

since he can't take part of a person to the game the answer is 9 people

hope this !