উত্তর সিলেক্ট করলে সঠিক ও ভুল দেখাবে।
ব্যাখ্যা ও সঠিক সমাধান
উত্তর:
40 years
Hints: Let, 4 years ago 9 person total age = x
Now, Increase age of 10 member with old man = 10 × 4 = 40
Total present age of 10 member = x + 40
Again let present age of younger member = y
Total present age of 10 new member = x + y
According to question.
x + 40 / 10 = x + y/ 10
x + 40 = x + y
y = 40
Age of younger member = 40