Peter 11

Peter is answering 10-word math problems. It takes him 1 ⅓ hour to answer five and 1 ½ hours to answer 5. On average, how many minutes does it take him to answer a problem?

Correct answer:

x =  17 min

Step-by-step explanation:

a=131=1+31=31 3+1=33+1=341.3333 h b=121=1+21=21 2+1=22+1=23=1.5 h  X=5+5a+b=5+534+23=60170.2833 h  x=X min=X 60  min=0.2833 60  min=17 min=17 min

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