I have the answer, but wouldn't 20 go to both sides. I am a little basic when it comes to math
2007-02-24 22:37:44 · 6 answers · asked by Cassie C 1 in Science & Mathematics ➔ Mathematics
Multiply the first by 5 and the second by 4
5/20 + 4/20 = 1/t
Add them together
9/20 = 1/t
multiply both sides by t
9t/20 = 1
multiply bs by 20
9t = 20
divide bs by 9
t = 20/9
2007-02-24 22:43:48 · answer #1 · answered by Michael T 5 · 0⤊ 0⤋
First we notice that there is a restriction on t because it is in the denominator. So, t must not be zero.
Here LCD=20t.
We can now multiply each term of the original equation by the LCD. We get: 5t + 4t = 20 or 9t = 20 or t=20/9 which is acceptable if we check against our restriction.
2007-02-25 07:54:21 · answer #2 · answered by stardom65 3 · 0⤊ 0⤋
LCD = 20t so multiplboth sides by 20t:-
5t + 4t = 20
9t = 20
t = 20/9 = 2 (2/9)
2007-02-25 06:44:05 · answer #3 · answered by Como 7 · 0⤊ 0⤋
hi
1/4 + 1/5 = 1/t
4+5
-------------= 1/t ........> 9/20 = 1/t
20
t = 20/9 = 2.2222222222222222222222222222
thanks
2007-02-25 07:35:52 · answer #4 · answered by sangoku sangoku 2 · 0⤊ 0⤋
multiply by 20 both sides and you have
5 + 4 = 20/t
multiply by "t" both sides
5t + 4t = 20
simplify
9t = 20
divide by 9 both sides
t = 20/9
2007-02-25 06:45:21 · answer #5 · answered by Anonymous · 0⤊ 0⤋
must t not=0
t*4*5*1/4+t*5*4*1/5=t*4*5*1/t
5*t+4*t=20
9*t=20
t=20/9
2007-02-25 06:43:47 · answer #6 · answered by Anonymous · 0⤊ 0⤋