Respuesta :
Answer:
Diane sent 21messages
John sent 30 messages
Hans sent 84 messages
Step-by-step explanation:
Total messages =135
let messages sent by Diane =x
""". sent by John=x+9
sent by Hans=4x
Now the sum
x+x+9+4x=135
6x+9=135
6x=135-9
6x=126
x=126/6
x=21
Diane's message=x=21
John's message=x+9=21+9=30messages
Hans' messages=4×x=4×21=84