Question

Rita, ali, and deandre sent a total of 85 text messages during the weekend. Deandre sent 3 times as many messages as ali. Rita sent 5 more messages than ali. How many messages did they each send?

Answer 1

You would use matrix. r+a+d=85 0r- 3a+d=0 r- a+0d=5 r=21 a=16 d=48 Rita sent 21 text messages, Ali sent 16 text messages, and Deandre sent 48 text messages.