SOLUTION: a.Nellie's age is 2 years more than twice Mark's age. Last year Mark was one-third of Nellie's age. How old are Mark and Nellie?
b. Andrea had twin sisters, Emma and Ethel. In 4
Algebra ->
Percentage-and-ratio-word-problems
-> SOLUTION: a.Nellie's age is 2 years more than twice Mark's age. Last year Mark was one-third of Nellie's age. How old are Mark and Nellie?
b. Andrea had twin sisters, Emma and Ethel. In 4
Log On
Question 1038161: a.Nellie's age is 2 years more than twice Mark's age. Last year Mark was one-third of Nellie's age. How old are Mark and Nellie?
b. Andrea had twin sisters, Emma and Ethel. In 4 years Andrea will be as old as the twins are now. The sum of the sister's age is 24. How old is each sister?
You can put this solution on YOUR website! Equation One: N=2m+2
Equation two: 1/3 (N-1) = (m-1) multiply this equation by 3 to get rid of the denominator: (N-1) = 3m - 3
These are two equations two unknown. m is for mark and N is for Nellie
Solving the following two equations:
N=2m+2
(N-1) = 3m - 3 by subtracting the second equation from the first we get m=4 and N=10
Second problem
E for one the twin sisters
E for another twin
E-4 is for Andrea since Andrea is four years younger than twins
We add all three sister's ages: E+E+E-4 = 24
3E - 4 = 24 solving this equation we get E = 9and 1/3 = age of the twin sisters
Considering that Andrea is 4 years younger her age = 9 and 1/3 - 4 = 5 and 1/3
(