a) 1
b) 2.5
c) 3
d) 3.5
Answer: c
Explanation:
$$\eqalign{
& = x:7.5 = 7:17.5 \cr
& 17.5x = 7.5 \times 7 \cr
& x = \frac{{7.5 \times 7}}{{17.5}} \cr
& = 3 \cr} $$
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