Question 335870
One grandfather has three grandchildren, two of their age difference is 3, 
eldest child age is 3 times youngest child’s age and
 eldest child’s age is two times of sum of other two children.
 What is the age of eldest child?
:
Three grand-kids, x,y,z; z is the eldest
:
"eldest child age is 3 times youngest child’s age"
z = 3x
:
"and eldest child’s age is two times of sum of other two children.:
z = 2(x+y)
z = 2x + 2y
Replace z with 3x
3x = 2x + 2y
3x - 2x = 2y
x = 2y; but that make the y the youngest??? Don't think this can be done!!