Jinxiu primary school fifth grade second volume final mathematics additional problem second problem - Training Enrollment Network

Jinxiu primary school fifth grade second volume final mathematics additional problem second problem

Suppose there are X students in grade five, Y students in grade four and other Z students.

So X+Y= 12? X+Z=22？ Y+Z=26

Triple addition: 2X+2Y+2Z=60.

X+Y+Z=60/2=30

30-(X+Y)= 30- 12 = Z = 18

That is, other *** 18 people.

A: 18 people.

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