Q.1 Ans is C
Sol: (a + x) / (b+x) = c/d
d(a + x) = c(b + x)
ad + dx = cb + cx
(d-c)x = cb-ad
x = (cb - ad) / (d-c)
x = (ad - cb) / (c-d)
Q.2 Ans is B
Sol: i) a/b = c/d
ad = cb
ad/c = b
a/c = b/d (True)
Sol: ii) (a + b)/b = (c-d)/d
a/b + b/b = c/d - d/d
a/b + 1 = c/d - 1
a/b = c/d - 2 (False)
Sol: iii) (a-b) / b = (c-d) / d
a/b - b/b = c/d - d/d
a/b - 1 = c/d - 1
a/b = c/d (True)
