Task: Question Answering
Input (English): Problem: 120 kg of an alloy a is mixed with 180 kg of alloy b. if alloy a has lead and tin in the ratio 2: 3 and alloy b has tin and copper in the ratio 3: 5, then the amount of tin in the new alloy is ?
Options: a. 100.6 kg, b. 120.3 kg, c. 139.5 kg, d. 140.8 kg, e. 114.5 kg
Output (English): c