Your school talent show allows people to sign up for 3 min. or 5 min. acts. There is 1 min. between acts. The talent show has 15 acts and lasts for 79 min. How many 3 minute acts are there?

Answer 1

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Answer 2

If there are x 3-min acts and y 5-min acts, then you have 14 intermissions, so
x+y = 15
3x+5y+14=79