when 30% of a no. is added to another no., the second no. increases by 20% what is ratio b/w 1st & 2nd no.s?

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when 30% of a no. is added to another no., the second no. increases by 20% what is ratio b/w 1st & 2nd no.s?

please explain the answer thoroughly... i want it fast....

2007-02-04 01:29:03 · 3 answers · asked by Steve 1 in Science & Mathematics ➔ Mathematics

3 answers

Let the 1st no. be x and second be y.
x + 30% 0f x +y = y + 20% of y
That is x + o.3x +y = y + 0.2 y
Or 1.3 x = 0.2 y
Thus x/y = 1.3/0.2 = 13/2
or x : y = 13 : 2
So the ratio between x and y is 13 : 2

2007-02-04 01:37:49 · answer #1 · answered by Malini 1 · 0⤊ 1⤋

0.3x+y=y+0.2y
0.3x=0.2y
multiplying by 10
3x=2y
so x:y=2:3

2007-02-04 10:56:53 · answer #2 · answered by raj 7 · 0⤊ 0⤋

.3x + y=1.2y
-y =-y
.3x=.2y
y=1.5x

Three parts x equals 2 parts y
3:2

2007-02-04 09:45:50 · answer #3 · answered by Matthew P 4 · 0⤊ 1⤋