Originally Posted by redmax

Dear Umar,
Your assumption was slightly incorrect. No any diagram is given with the question. However, the reference you have now mentioned clarifies the logic as well as justifies the answer given in the book.

The rear wheel should get 55-60% weight. And the front wheel 40-45%.
Based on this, we can say if total weight is 72 Kg, then the rear should get approximately 42 Kg and the front wheel should get approx. 30 Kg. And amazingly, this answer matches with that of the book.