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#1.
7:4
Difference 12
Let the no. be X and Y,
7Y=4X , Y = 4/7 X
Y-X = -12
4/7X-X=-12 ,
X = 28 , Y =16
#2
5 : 22
X * Y = 440
22X = 5Y
(5/22)Y*Y=440 Y =±√1936 =±44 Hence X =±10
Pair : 44 and 10, -44 and -10
#3
11:12
X+Y = 207
12X=11Y
11/12 Y+Y = 207
Y = 108, X = 99
#4
2:1 ,
X+Y = 9/4
2Y = X
2Y + Y = 9/4
Y= 3/4, X = 6/4
#5
3:4
X-Y = -1.9
4X=3Y
3/4 Y - Y = -1.9
Y = 5/38
X = 10/57