Answer: He gained 60.5 kilograms
Explanation:
Hi, to answer this question we have to simply multiply the amount of weight he gains per month (5.5) by the number of months passed ( 11).
Mathematically speaking:
5.5 kilograms per month x 11 months = 5.5 x 11 = 60.5 kilograms
In conclusion, he gained 60.5 kilograms
Feel free to ask for more if needed or if you did not understand something.