What is the answer to this problem?

In the figure below, segment ac is congruent to segment ab: triangle abc with a segment joining vertex a to point d on side bc. side ab is congruent to side ac which statement is used to prove that angle abd is congruent to angle acd? segment ad bisects angle cab. triangle acd is similar to triangle abd. segment ad is congruent to segment ac. angle cab is congruent to angle cba.

Pls! does anybody know a shortcut for answering these types of questions in the future?

Anyone? 15m is what percent of 60m; 3m; 30m; 1.5 km?