sierravick123owr441
12.10.2019 •
Mathematics
It costs $0.07 to send a text message and $0.12 to send a picture on your cell phone. you spend $3.38 and send twice as many text messages as pictures. how many text messages did you send?
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Ответ:
it costs $0.07 to send a text message
so total cost of sending txt msg = 0.07m
Let picture is p
it costs $0.12 to send a picture
total cost of sending pics = 0.12p
You spend $3.38:
means: 0.07m + 0.12p = 3.38
AND
You send twice as many text messages as pictures:
means: m = 2p
solving these two equations together:
0.07m + 0.12p = 3.38
m = 2p
yields:
m = 26
p = 13
You sent 26 text messages and 13 pictures on your cell phone
Ответ:
9×5=45
About 45 messages per hr