The ages of rahul and haroon are in ratio 7: 5. four year later the sum of their ages will be 56 years. find their present ages.

Let r = Rahul's age and h = Haroon's age. Then:-

r = 1.4h ( because 7/5 = 1.4)

r + 4 + h + 4 = 56

r + h = 48

Substituting r = 1.4h:-

1.4h + h = 48

h = 48 / 2.4 = 20

and r = 48 - h = 48 - 20 = 28

So answer is Rahul is 28 and Haroon is 20 years old at the present time.

it would be 6xy and -16xy.

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