Sam is trying to make 12 packs of rice. She packed 2 1/2 kg of rice in each of the first 4 packs & 2 3/4 kg of rice in each of the remaining 8 packs. How many kgs of rice did she pack?

32 kg

Step-by-step explanation:

1. Convert the fractions to decimals:

2 1/2 = 2.5

2 3/4 = 2.75

2. Set up the equation to show 4 packs of 2.5 kg and 8 packs of 2.75 kg:

4*(2.5) + 8*(2.75)

3. Solve the equation using PEMDAS:

4(2.5) + 8(2.75)

10 + 8(2.75)

10 + 22

32

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