Now Antony is 3 times as old as his little sister Sarah. In two years Antony will be 2 times as old as Sarah. Find their present ages.

sister = 2 years old, brother = 6 years old

Step-by-step explanation:

2 times 3 is 6, so the brother is triple her age.

if you add 2 years to both of them you get 4 and 8, which is double the age

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