After a piece of wood is cut off 100 cm, the remaining wood is 30 cm shorter than the original 1.2 times. How many centimeters are left?
Let x cm keep, and set the equation according to the meaning of the question;
x+ 100= 1.2x-30
x=650
A: There are 650 centimeters left.
Formula: (100+30)/(1.2-1) = 650 (cm)