If the length of AB is one-fourth the length of AC, what is the length of AB?
a)25
b)30
c)10
d)40

Question

shadowfiend · Answer

Er... Do you have a length for AC?

anonymous · Answer

yes sorry iforqot to put that down . . the length for AC is 30

shadowfiend · Answer

Wait... The length of AC is 30, and the length of AB is on-fourth the length of AC? Then the answer is not one of the ones you have listed.

anonymous · Answer

ohh i see , uhmm how do you solve the problem? can you please explain it to me.

shadowfiend · Answer

Well, if the length of AB is one fourth the length of AC, that means:

$$AB = \frac{1}{4}AC = \frac{AC}{4} = AC \div 4$$

That's pretty much it if you have the length of AC.