Task: Question Answering
Input (English): Problem: a 70 kg metal bar made of alloy of tin and silver lost 7 kg of its weight in the water. 10 kg of tin loses 1.375 kg in the water; 5 kg of silver loses 0.375 kg. what is the ratio of tin to silver in the bar ?
Options: a. 1 / 4, b. 2 / 5, c. 1 / 2, d. 3 / 5, e. 2 / 3
Output (English): e