Erin's age is 3 times Warren's. In 4 years she will be twice as old as he will be. How old is each now?
your help will be highly appreciated.!!
2007-06-20 10:58:43 · 9 answers · asked by boylova_music2 1 in Science & Mathematics ➔ Mathematics
E = 3W
E + 4 = 2(W + 4)
Substitute
3W + 4 = 2(W + 4)
3W + 4 = 2W + 8
W + 4 = 8
W = 4
E = 3(4)
E = 12
Warren is 4 years old and Erin is 12 years old.
2007-06-20 11:02:17 · answer #1 · answered by suesysgoddess 6 · 2⤊ 0⤋
Equation 1: e = 3w
Equation 2: e + 4 = 2(w + 4)
We can substitute 3w for e in equation 2, and we get
3w +4 = 2(w + 4)
3w + 4 = 2w + 8
w = 4
So, Warren is 4, Erin in 12.
In four years, Warren will be 8 and Erin will be 16.
2007-06-20 11:06:47 · answer #2 · answered by Seosamh 3 · 0⤊ 0⤋
Let x be Warren's age.
I'm going to make two separate rows: Age now and age in 4 years.
Age now: Warren: x, Erin: 3x
Age in 4 years: Warren: x + 4, Erin: 3x + 4
Erin's age in 4 years is 3x + 4.
Warren's age in 4 year is x + 4.
In 4 years Erin will be twice as old as he will be. That is,
{erin's age in 4 years} = 2 times {warren's age in 4 years}
3x + 4 = 2(x + 4)
3x + 4 = 2x + 8
x = 4
That makes Warren's age 4, Erin's age 3(4) = 12.
2007-06-20 11:03:50 · answer #3 · answered by Puggy 7 · 1⤊ 0⤋
12 is the age of Erin. And Warren is 4.
12 + 4 = 16
4 + 4 = 8
8/16 = 1/2 (Twice as old.)
2007-06-20 11:03:33 · answer #4 · answered by Guy 1 · 0⤊ 0⤋
Mental math approach:
In 4 years, the age difference changes from 3 times to 2 times, which means Warren's age must be 4 years now. Therefore, Erin's age must be 12 years.
2007-06-20 11:07:19 · answer #5 · answered by sahsjing 7 · 0⤊ 1⤋
Let Warren's age be w yr.
Then Erin's age is 3w yr .........(1)
In 4 years, Warren's age will be w + 4, and Erin's will be
3w + 4.
Therefore:
3w + 4 = 2(w + 4)
Multiply out the brackets:
3w + 4 = 2w + 8
Subtract 2w from each side:
w + 4 = 8
Subtract 4 from each side:
w = 4.
From (1), 3w = 12.
Therefore Warren's age is 4yr, and Erin's is 12yr.
2007-06-20 11:07:00 · answer #6 · answered by Anonymous · 0⤊ 0⤋
let E be the Erin's age and W be warren's age
Erin's age is 3 times as warren's tells you:
E = 3W
In 4 years, that means both Erin and Warren will be 4 years older, she (Erin i suppose) will be twice as old as he will be tells you:
E + 4 = 2 (W + 4)
we know that E = 3W, plug it in
3W + 4 = 2 (W + 4)
3W + 4 = 2W + 8
W + 4 = 8
W = 4
E = 3W
E = 3(4)
E = 12
Erin is 12 and Warren is 4
2007-06-20 11:04:27 · answer #7 · answered by 7 · 0⤊ 0⤋
Let Warren be x years
Erin is 3x
3x + 4 = 2.(x + 4)
3x + 4 = 2x + 8
x = 4
Warren is 4 years
Erin is 12 years
2007-06-24 10:22:47 · answer #8 · answered by Como 7 · 0⤊ 0⤋
warren is 4
Erin is 12
2007-06-20 11:02:44 · answer #9 · answered by a person 5 · 1⤊ 0⤋