if the ratio of 2x to 5y is 3 to 4, what is the ratio of x to y?
2x/5y =3/4
15=8
please give me some hint about the concept on this one!!!I got it through but can't figure out the relation between them. why the extreme to the mean would be x to y?????
2007-01-18 18:28:37 · 4 answers · asked by liangjizong22 1 in Science & Mathematics ➔ Mathematics
why multiply 5/2 not 2/5? please give me more idea.
2007-01-18 18:58:23 · update #1
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hmmm, do it the "simple" way
2x / 5y = 3 / 4 ... [multiply both sides by 5 / 2]
10x / 10 y = x / y = (5*3) / (2*4) = 15 / 8
which means that x / y = 15 / 8 which
is another way of saying:
[the ratio of "x to y" is "15 to 8"]
2007-01-18 18:43:33 · answer #1 · answered by atheistforthebirthofjesus 6 · 0⤊ 0⤋
YOu multiplied both sides by 5/2 because u nid to cancel out 2/5 in the expression in the left so that X/Y will remain giving u a ratio.
2007-01-19 03:31:46 · answer #2 · answered by 2cute4u 2 · 0⤊ 0⤋
if 2x/5y = 3/4
then
(2/5)(x/y) = 3/4
(2*5/5*2)(x/y) = (3*5)/(4*2)
x/y = 15/8
2007-01-19 02:54:28 · answer #3 · answered by Helmut 7 · 0⤊ 0⤋
if 2x/5y = 3/4 then (cross-multiply) 8x=15y, then (cross-divide) x/y = 15/8
2007-01-19 02:47:22 · answer #4 · answered by TV guy 7 · 0⤊ 0⤋