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2007-06-22 14:30:02 · 6 answers · asked by Harley 1 in Science & Mathematics ➔ Mathematics
reduce 28/20
28 / 20 = 7/5
42/x = 7/5
cross multiply
7x = 210
x = 30
2007-06-22 14:35:04 · answer #1 · answered by 7 · 0⤊ 0⤋
28/20 = 7/5 = 42/30 = 42/x
x = 30
2007-06-23 09:55:17 · answer #2 · answered by Como 7 · 0⤊ 0⤋
I would multiply 42 times 20 and get 840= 28X. Then I would divide 840 by 28 and get 30. X = 30
I think this is right. It's been a long time since I had to do this, but I used to like this kind of math. Hated Geometry!!!!
Hope this helps! :-)
2007-06-22 21:37:25 · answer #3 · answered by Anonymous · 0⤊ 0⤋
Re-write it....
42 = 28
X ..... 20
cross-multiply and solve for X...
42 x 20 = 28X
840 = 28X
840/28 = X
30 = X
2007-06-22 21:51:30 · answer #4 · answered by Next Up 4 · 0⤊ 0⤋
42/x = 28/20
42x20 = 840
840 divided by 28
x = 30
2007-06-22 21:39:48 · answer #5 · answered by lighthouse_lover92 4 · 0⤊ 0⤋
42......28
---- = ------
x.........20
If an equation is a proportion, then cross multiplying gives an equivalent equation.
(42)(20) = (28)(x)
(42)(20)
------------ = x
28
30 = x
Answer: x = 30
2007-06-22 21:37:54 · answer #6 · answered by mathjoe 3 · 0⤊ 0⤋