Question

A change can be more than one type.why

Answer 1

it may be physical or chemical change and sometimes even both

Answer 2

A change can be physical as well as chemical.
For example, when a candle burns, it shows both physical and chemical change. Burning of the wax of the candle is a physical change as we can again make the candle using the molten wax. On the other hand, burning if the thread of the candle is a chemical change as it is impossible to renew the thread.