a) 8
b) 7.5
c) 6.5
d) 5
Answer: d
Explanation:
$$\eqalign{
& {\text{Let }}x{\text{ be added to each term}}. \cr
& \frac{{ {7 + x} }}{{11 + x}} = \frac{3}{4} \cr
& \,33 + 3x = 28 + 4x \cr
& \,x = 5 \cr} $$
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