SOLUTION: Today, Mr. D is 21 years younger than his neighbor. 3 years ago, the neighbor was twice as old as Mr. D was back then. Find the neighbor's current age. Please provide a chart or l

Question 229370: Today, Mr. D is 21 years younger than his neighbor. 3 years ago, the neighbor was twice as old as Mr. D was back then. Find the neighbor's current age. Please provide a chart or let statement.
Answer by ankor@dixie-net.com(22740) (Show Source): You can put this solution on YOUR website!
Today, Mr. D is 21 years younger than his neighbor. 3 years ago, the neighbor was twice as old as Mr. D was back then. Find the neighbor's current age.
:
Let d = D's present age
Let n = neighbor's present age
:
" Mr. D is 21 years younger than his neighbor."
d = n - 21
:
3 years ago, the neighbor was twice as old as Mr. D was back then.
n - 3 = 2(d - 3)
n - 3 = 2d - 6
n = 2d - 6 + 3
n = 2d - 3
Replace d with (n-21)
n = 2(n-21) - 3
n = 2n - 42 - 3
n - 2n = -45
-n = - 45
n = 45 yrs neighbor's present age
;
:
See if that flies in the statement (d = 45 - 21 = 24);
3 years ago, the neighbor was twice as old as Mr. D was back then.
45 - 3 = 2(24 - 3)
42 = 2(21)

RELATED QUESTIONS
Mr. Jackson is 13 years less than three times as old as his son. Six years ago he was... (answered by Maths68)

Mr. Jackons is 13 years less than 3 times as old as his son. six years ago he was 14... (answered by Paul)

Mr. Jackson is 13 years less than 3 times as old as his son. Six years ago, he was 14... (answered by stanbon)

Mr. johnson was married 18 years ago and he was 3 times as old as his wife. Today he is... (answered by rahul)

Mr. Atkins is 33 years old and Mr.s Speyer is 27 years old. How many years ago was Mr.... (answered by Earlsdon)

Mr. Jacobs is 4 times as old as his son. Five years ago, he was 9 times as old as his... (answered by w_parminder)

1. Mr. Alvarado is 20 years old older than his son. In 5 years, he will be 5 years more... (answered by stanbon)

Mr. Granger is 10 years more than twice as old as his son. However, last year he was 4... (answered by fractalier)

Mr. Adams is 33 and Mr. Spicer is 27. How many years ago was Mr. Adams twice as old as... (answered by ewatrrr)