A) 5 years
B) 7 years
C) 4 years
D) 6 years
Correct Answer: C
Solution :
Let the present age of the boy be 'x' years. 12 years from now, his age will be\[\text{1173}0=\text{2}\times \text{3}\times \text{5}\times \text{17}\times \text{23}\]years. According to the problem, \[\therefore \] \[=\text{17}\times \text{23}=\text{391}\] \[=\text{2}\times \text{3}\times {{\text{5}}^{\text{2}}}\times \text{7}\times \text{l7}\times \text{23}=\text{41}0\text{55}0\] \[\pi \] \[\frac{22}{7}\] Since age cannot be negative, the required present age of the boy is 4 years.
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