a) 36 years
b) 40 years
c) 46 years
d) Cannot be determined
Answer: b
Explanation: Let daughter’s age be x years.
Suresh’s age = 2x years
$$\eqalign{
& \therefore \frac{{2x + 6}}{{x + 6}} = \frac{{23}}{{13}} \cr
& 13\left( {2x + 6} \right) = 23\left( {x + 6} \right) \cr
& 26x + 78 = 23x + 138 \cr
& 3x = 60 \cr
& x = 20 \cr} $$
Present age of Suresh = 2x years
$$\eqalign{
& {\text{ = }}\left( {2 \times 20} \right){\text{ years }} \cr
& {\text{ = 40 years}} \cr} $$
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