240x？ 10-240x=4

Solve x=30 or -20 (irrelevant, omitted).

X=30 is the solution of the original equation.

There are 30 students.

(2) Draw two different cutting methods according to the meaning of the question, as shown in the figure:

If it is the picture on the left, according to the picture, the width of the cut colored flag is 13a and the length is 1.

Then it is 13a: 1 = 1: a, that is, a2=3, and the solution is: A = 3；;

If it is on the right, according to the figure, the length of rectangular silk is a and the width is 1.

Then the width of the cut colored flag is 12 and the length is 1.

That is, a = 12+ 1 = 32.