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

[EX Q]: Problem: how many liters of a 40 % iodine solution need to be mixed with 35 liters of a 20 % iodine solution to create a 34 % iodine solution ?
[EX A]: 13

[EX Q]: Problem: what ratio must a shopkeeper mix peas and soybean of rs . 16 and rs . 25 / kg , as to obtain a mixture of rs . 21.50 ?
[EX A]: 7 : 11

[EX Q]: Problem: find the area of trapezium whose parallel sides are 20 cm and 18 cm long , and the distance between them is 11 cm .
[EX A]:
209 cm 2