The task is to generate the correct answer for a given math problem.

Problem: what will be the percentage increase in the area of the cube ' s surface if each of the cube ' s edges grows by 20 % ?
44 %

Problem: a car salesman earns a base salary of $ 1000 per month plus a commission of $ 200 for each car he sells . if the car salesman earned $ 2000 in march , how many cars does he need to sell in april in order to double his march earnings ?
15

Problem: jacob is 16 years old . he is 2 times as old as his brother . how old will jacob be when he is twice as old ?
2