People's Education Press Primary School Grade Five Volume II Huanggang Roll-up Exercise Test Unit 4 Roll-up Happy Exploration of Intellectual Surfing
Solution: There are X classmates for dinner.
1/2 X+ 1/3 X+ 1/4 X=65
Thirteen tenths X=65
X=65 divided by one thirteenth.
X=60
A: 60 students eat.