timothy was 7 years old when ada was born. hal, who is 5 years older than timothy, is now 3 times as old as ada. how old is each person now?
2007-11-25 15:45:29 · 3 answers · asked by wowz 2 in Science & Mathematics ➔ Mathematics
x years later
ada = x, Timothy = x+7 and Hal = x + 12
x+12 = 3x
x = 6
ada = 6, T= 13, H = 18
2007-11-25 15:52:04 · answer #1 · answered by norman 7 · 0⤊ 0⤋
It helps to make a table (but it's hard to make a table here, so I'll just write it out):
When Ada was born:
Tim was 7
Ada was 0
Hal was 7 + 5 = 12
Today:
Ada is x years old
Tim is x + 7
Hal is 3x
Looking at Hal's age: He was 12 when Ada was born and it is now x years later, so his age is 12 + x. Also, he is 3 time Ada's age, so his age is also 3x. We can equate the two expressions because they are two representations of the same thing (Hal's age):
12 + x = 3x
Solving for x:
x = 6
Therefore, Ada is 6, Hal is 18, and Tim is 13.
To check, consider 6 years ago, Ada is newly-born (0), Hal is 12, and Tim is 7. This matches the information given so the answer is correct.
2007-11-25 15:58:51 · answer #2 · answered by Ugin T 2 · 1⤊ 0⤋
i hate math.
okay
so
tim is 7 years older than ada
hal is 5 years older than tim
screw this my head hurts
2007-11-25 15:53:42 · answer #3 · answered by Rocky B. 1 · 0⤊ 0⤋