SOLUTION: Three times Jack’s age +2 times Jill’s age equals 64. Jack is also two times Jill’s age. how old is Jack?

Algebra.Com
Question 1153494: Three times Jack’s age +2 times Jill’s age equals 64. Jack is also two times Jill’s age. how old is Jack?
Found 2 solutions by MathLover1, MathTherapy:
Answer by MathLover1(20850)   (Show Source): You can put this solution on YOUR website!

let Jack’s age be ,
Jill’s age
if three times Jack’s age + times Jill’s age equals , we have
......eq.1
if Jack is also two times Jill’s age, then Jack is:
.....eq.2
go to
......eq.1, substitute
......solve for




go to eq.2
.....eq.2, substitute


so, Jack is years old

Answer by MathTherapy(10552)   (Show Source): You can put this solution on YOUR website!

Three times Jack’s age +2 times Jill’s age equals 64. Jack is also two times Jill’s age. how old is Jack?
Let Jack's age be J, and Jill's L

Then 3J + 2L = 64 ----- eq (i)

Also, J = 2L ----- eq (ii)

3J + J = 64 ----- Substituting 2L for J in eq (i)

4J = 64

J, or  

RELATED QUESTIONS


Three times Fred’s age plus four times Jane's age equals 71. Fred's age is also three... (answered by fractalier)

Six times ashleys age plus two times sydney's age equals 38. sydney's age is also three... (answered by aYummyNoodle)

Four times Pete's age minus three times Jame's age equals 20.
Pete's age is also two... (answered by fractalier)

  If two times Sam’s age plus three times Sarah’s age equals 34 and Sarah’s age is also... (answered by josgarithmetic,greenestamps)

Jack said, "five times my age in 2yrs is 100, how old is jack... (answered by alicealc)

Five times Jane's age plus two times Fred's age equals 51. 

Jane is also three times... (answered by josgarithmetic)

Five times Jane's age plus two times Fred's age equals 51. 

Jane is also three times... (answered by josgarithmetic,Alan3354)

Harold is twiCE AS OLD as jack,who is three years older than dan.if harolds age is five... (answered by jim_thompson5910)

six times Paul's age plus three times Annette's age equals 72. Annette's age is also four  (answered by JulietG)