Task: Question Answering
Input (English): Problem: if 2 tic equals 3 tacs and 2 tacs equal 7 tocs, what is the ratio of one tic to one toc ?
Options: a. 15 / 2, b. 6 / 5, c. 21 / 4, d. 3 / 10, e. 1 / 15
Output (English): c