At noon a tank contained 8 cm of water after several hours it contained 2 cm what is the percent decrease of water in the tank

75%

Step-by-step explanation:

The percent would be the total cm of water, then minus the left over water divided by the original amount of water, and finally multiplying one hundred.

(8-2)/8*100=75%

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