Explanation:
Let the ages of son and daughter be 5x and 4x Then
By the question
The age of a man is equal to the sum of the ages of his son and daughter . So
5x + 4x = 9x
Now
it is given that
age of the man = 45
or 9x = 45
x = 45 / 9
x = 5
Finally
Age of son = 5x = 5 * 5 = 25
Age of daughter = 4x = 4 * 5 = 20
Hope it will help :)❤