Shuguang Primary School held a calligraphy competition. The school bought 360 brushes and pens, of which the number of brushes was twice that of pens.

Solution: Suppose you buy X pens and 2x brushes.

2x+x=360

3x=360

x=360÷3

x= 120

Number of brushes = 2x = 2x120 = 240.

A: The school bought 120 pens and 240 brushes.