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The fifth grade mathematics first volume exercise book equation application problem.
1. Let the number of people in the morning be x and the number of people in the afternoon be 2X.

X+2X=840

3X=840

X=280

2. let Xiao Ming be X.

3X=X+22

2X=22

X= 1 1

3. I saw it myself ~

Suppose Xiaoming has x books.

x+5=50÷2

x=20

Or suppose Xiaoxiao has X books.

x-5 = 50 \2

x=30

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