Mrs. longchamp spent exactly $224 when she bought 28 more books for the library. she spent $96 on non -fiction books and $128 on fantasy books. the price of each non fiction was the same as the price of each fantasy book. how many of each did she buy?

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

tip $2.90

total $17.40