maria is 6 time as old as tina , in 20 years , maria will be only twice as old as tina . how old is maria now.
2007-09-30 14:51:19 · 6 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
tina=X
maria=6X
6X+20=2(X+20)
6X+20=2X+40
4X=20
X=5
maria is now 30
2007-09-30 14:56:16 · answer #1 · answered by Anonymous · 2⤊ 0⤋
Let Tina's age = x
Maria's age = 6x
In 20 years, Maria's age =6x+20
6x+20= 2(x+20)
6x+20=2x+40
4x=20
x=5 (Tina)
6x=30 (Maria)
In 20 years Maria will be 50. Tina will be 25.
Maria will be twice as old as Tina.
2007-09-30 14:59:04 · answer #2 · answered by cidyah 7 · 1⤊ 0⤋
Let maria's current age be 6t (6 times tina's current age)
Let t + 20 be tina's age in 20 years.
6t + 20 = 2(t + 20)
6t + 20 = 2t + 40
4t = 20
t = 5
Tina is now 5, Maria is now 30
2007-09-30 14:57:30 · answer #3 · answered by SoulDawg 4 UGA 6 · 1⤊ 0⤋
start off naming multiples of six
and then dividing when you get to a multiple whos last number is its factor x2(ie 30/6=5 5x2 =10[sry kinda confusing)
then add 20 to both numbers
they will then be 50 and 25 therefore maria is 30 now
2007-09-30 14:59:18 · answer #4 · answered by OneTrueQueen 3 · 1⤊ 0⤋
Just start guessing is what i did, like 50-25, 20 years back is 30-5... etc.
2007-09-30 14:54:50 · answer #5 · answered by JUSTaPREPPYguy 4 · 0⤊ 3⤋
The circumference of a circle is d?, the place d is the diameter. The diameter of a circle is 2r, the place r is the radius. So the circumference of a circle is 2r?, the place r is the radius. you basically prefer the arc length of ¼ of the circle, so the formula you prefer is: s = ¼(2r?) Which, as you already know, works out to 5?.
2016-10-10 02:02:48 · answer #6 · answered by Anonymous · 0⤊ 0⤋