Continues 4034

Karel always follows the same route to school. If he continues at the store, the journey takes him exactly 10 minutes. If he stops at a store to buy a snack, his journey takes 5 minutes longer. In November 2015, his journey to school took an average of 13 minutes. How many times did he stop at the store that month?

Correct answer:

x =  12

Step-by-step explanation:

n=20 (10n + 5x)/n = 13 10 + 5x/n = 13 x=(13 n10 n)/5=(13 2010 20)/5=12



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