The sum of a number and its reciprocal is 17/4. Find the number.
The speed of a boat in still water is 5 km/hr. The speed of the stream is 2 km/hr. The distance travelled by a boat upstream in 3.5 hrs is
Present ages of X and Y are in the ratio 5:6 respectively. Seven years hence this ratio will become 6:7 respectively. What is Xs present age in years?
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