Mario received y text messages each minute for 10 minutes yesterday, and received t text messages each minute for 20 minutes today. What is the total number of text messages he received for two days in terms of y and t?

Explanation

To find the total number of text messages Mario received for two days, calculate the messages for each day separately:For yesterday, with y messages each minute for 10 minutes, Mario received a total of 10y messages.For today, with t messages each minute for 20 minutes, Mario received a total of 20t messages.Therefore, the total number of messages for two days is 10y + 20t.Options A and B are incorrect as they do not consider the given times for each day. Option C is incorrect due to the incorrect placement of coefficients for y and t. The correct answer is Option D because it correctly calculates the total messages received by considering the specific times for each day.