30 because 120 divided by 4 is 30. 4 is represented by 25%. Just think of it this way. Four quarters makes one loony so four 25% makes 100%. So 25%=4.
What's 25% of 120?
Convert 25% to decimal form by dividing 25 by 100. Then multiply x 120
120*0.25 = 120/4 = 30