To prepare for a New Year's parade John practice marching and playing his tuba for 15 minutes he took a break and then practiced 25 more minutes how many minutes did John practice in all

15 + 25 = 40 minutes total.

He practiced 40 minutes in all.

Step-by-step explanation:

Given,

The total time taken by him in practice before break = 15 minutes,

While, after break he practiced 25 more minutes,

Hence, the total time taken by him in all = Time taken before break + Time taken after break

= 15 minutes + 25 minutes

= 40 minutes.