Answer:
Ashley sent 30
Pablo sent 23
Milan sent 69
Explanation:
let A = messages sent by Ashley
P = messages sent by Pablo
M = messages sent by Milan
Ashley, pablo, and milan sent a total of 122 messages over their cell phones during the weekend.
A + P + M = 122
Milan sent 3 times as many messages as pablo
M = 3P
Pablo sent 7 fewer messages than ashley
P = A - 7 or A = P + 7
A + P + M = 122
P + 7 + P + 3P = 122
5P = 122 - 7
5P = 115
P = 23
M = 3P
M = 3(23)
M = 69
P = A - 7
23 = A - 7
23 + 7 = A
A = 30