The average of age of father and mother is 45 years. If the age of daughter is included. The average of the three falls to 35. Find the age of daughter ?

25

Avg of father and mother=45

here total sum=45×2=90
when daughter is included avg is 35
so after including ,the sum is= 35×3=105
so daughter age is=105 - 90=15

15 years

15 years

35*3 -45*2= 105-90= 15 ans

the AVG. age of parents = (x+y/2)=45
x+y =90
given that (x+y+z/3)=35
x+y+z=105
WKT x+y=90
z=105-90=15