There are 1400 books on the upper and lower floors of the sixth grade bookcase, and the books on the upper floor are 75% of those on the lower floor. How many books are there upstairs?

There are 1400 books on the upper and lower floors of the sixth grade bookcase. The number of books on the upper floor is 75% of that on the lower floor, and there are 600 books on the upper floor.

According to the meaning of the question, there are x books in the lower level and 75%x books in the upper level.

Column equation:

75%x+x= 1400

0.75x+x= 1400

1.75x= 1400

x=800

75%x=75%x800=600

So there are 600 books upstairs.

Methods of solving equations:

1, denominator: both sides of the equation are multiplied by the least common multiple of each denominator.

2. Remove the bracket.

3. Move the term: move the term containing the unknown to the other side of the equation, and don't forget to change the sign when moving other terms to the other side of the equation.

4. Merge similar projects.

5, coefficient is one: both sides of the equation are divided by the unknown coefficient at the same time.

6. Find the solution of the equation.

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