Task: Question Answering
Input (English): Problem: the difference between the heights of two trees is 20 cm. 10 years ago, the taller one was thrice as taller as the shorter one. the present height of the taller tree is
Options: a. 300 cm, b. 15 cm, c. 20 cm, d. 10 cm, e. 40 cm
Output (English): a