SOLUTION: the sum of the present age of father and his daughter is 42 years 7 years later the father will be 3 times old then the daughter the present age of the father is

Question 803739: the sum of the present age of father and his daughter is 42 years 7 years later the father will be 3 times old then the daughter the present age of the father is
Answer by erica65404(394) (Show Source): You can put this solution on YOUR website!
You know that the age of the daughter plus the age of the father is 42 years. You will use the equation x+y=42 (x=father y=daughter). When its 7 years later and the father will be 3 times the age of his daughter. Both the father and daughter will have aged 7 years so you would add 14 to 42 and now your equation will be x+y=56. you also need an equation to show that the father will be 3 times the age of his daughter. You would use 3y=x. now to figure out the fathers age you would need to plug 3y=x into x+y=56. 3y+y=56 we will use this to find the daughters age first. You will get y=14. The father will be 3 times the age of his daughter. You can now plug y=14 into 3y=x to find what the fathers age will be. You now know the fathers age will be 42 in 7 years. Since it is present day, simply subtract 7 from 42 to find his current age. The father is 35 years old.
RELATED QUESTIONS
the sum of the present age of the father and his daughter is 42 years, 7 years. later,... (answered by clearblueskai)

The sum of the persentage age of a father and his daughter is 42 years.7 years later, the (answered by ankor@dixie-net.com)

two years ago kumar a father was 5 times as old as a son.2 years later,his age will be 8... (answered by richwmiller)

A father is three times his daughter's age. In 10 years time the sum of their ages will... (answered by Cromlix)

A father is three times as old as his son, and his daughter is 3 years younger than the... (answered by addingup)

a father is 42 years old,his son is 10 years old and his daughter is 16 years old. a)... (answered by lwsshak3,hamsanash1981@gmail.com)

two years ago a father was five times as old as his son.two years later his age will be 8 (answered by Cromlix)

A father is 4 times the age of his daughter. In 2 years time the father will be 46 years... (answered by Cromlix)

Father is 15 years older then his daughter. Father age is half the age of his daughter... (answered by josgarithmetic,Alan3354)