Final answer:
The average 25-34 year old sends 1130 texts per month, which is 20 more than they receive, totaling 2240 texts sent and received.
Step-by-step explanation:
The average 25-34 year old sends and receives a combined total of 2240 texts per month. Since they send 20 more texts than they receive, let's call the number of texts received R and the number of texts sent S. We can set up the following equations: R + S = 2240 and S = R + 20. Substituting the second equation into the first, we have R + (R + 20) = 2240. Solving for R, we get 2R + 20 = 2240, or 2R = 2220. Dividing both sides by 2, we find that R = 1110. To find S, we substitute R back into the second equation: S = 1110 + 20, yielding S = 1130. Therefore, the average 25-34 year old sends 1130 texts per month.