Row for lunch

There are less than 66 people in a row for lunch. In front of Eva, there are 28 students. Behind Martin, there are 30 people. Between Eva and Martin, there are 17 people. How many students stand behind Eva if Martin stands in front of Eva?

Correct answer:

x =  12

Step-by-step explanation:

x+1+17=30  x=12  x=112=12  x=12   Verifying Solution:   y+1+17=28  y=10  y=110=10  y=10  s=x+1+17+1+y=12+1+17+1+10=41  s<66

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