A person's present age is two-fifth of the age of his mother. After 8 years, he will be one-half of the age of his mother what is the present age of the mother?
বিকল্পসমূহ (নিজের উত্তর যাচাই করতে ক্লিক করুন):
সঠিক উত্তর
2 (40)
বিস্তারিত ব্যাখ্যা ও বিশ্লেষণ:
Solution:
Let the age of the person’s mother be ‘x’ units.
So, age of the person = (2x/5)
After 8 years, age of the person’s mother = ‘x + 8’ units.
So age of the person after 8 years = (2x/5) + 8
According to question:
(2x/5) + 8 = (a + 8)/2
=> (2x + 40)/5 = (a + 8)/2
=> 4a + 80 = 5a + 40
=>5a - 4a = 80 - 40
=> a = 40
So, the present age of his mother is 40 years.
